L5p nox sensor

FWIW, NOx sensors monitor the level of NOx in the exhaust, before and after the treatment process that uses the DEF. All of this is downstream of the engine, so driveability is not affected. ... Sold 2021 LM2 Sierra 4x4 crew 6.5 box, 2018 L5P Sierra 4x4 SB, 2011 LML Sierra 4x4 CCSB, 2010 LMM, 2004.5 LLY. Save Share. Like. D. Dmax310 …

Apr 8, 2021 ... A few weeks ago I got a CEL for P229F (faulty NOx sensor 2) and had it checked out and confirmed at a local indy shops that is known for working ...If you can access codes from the NOXS-A, then the U029D code is either intermittent or a memory code. If unable to access the NOXS-A, then the U029D code that the other modules are setting is active, and the problem is there now. The most common failure is a circuit fault which causes the loss of power or ground to the nox sensor a.NOX & O2 SENSORCleaning2017 L5P Duramax Code P026D. For those folks who may have the check engine light come on and the following code comes up: P026D, I want to let you know that, for me, it was the MAP sensor being dirty. It has happened twice in the last few months, and I have been able to clear the code by cleaning the sensor.L5P engines are less prone to problems, while LML700 engines have less power output and exhibit many issues, including DEF pump failures and NOx sensor malfunctions. The L5P engine is a more valuable choice because it is the latest model, much improved, and its spare parts are readily available in the market.4093 posts · Joined 2009. #2 · Jan 2, 2021. Most likely it is the MAF (Mass Air Flow) sensor, located between the air filter and turbo. Usually doesn't need much attention unless you are running an aftermarket oiled ail filter. Use only MAF cleaner if …Jun 29, 2023 · The reductant system uses two nitrogen oxide (NOx) sensors to monitor the amount of NOx in the engine’s exhaust gas. The first sensor is located at the outlet of the turbocharger and monitors the engine out NOx level. The second NOx sensor is located between the selective catalytic reduction (SCR) and the diesel particulate filter (DPF) and ... The automobile fault code P20EE indicates a problem with the SCR NOx Catalyst Efficiency. The estimated repair time for this issue is 1.0 hour. The cost of fixing this issue can vary depending on the auto repair shop, but it is common for them to charge between $75 and $150 per hour. Other factors that may influence the cost include the ...

The reductant system uses two nitrogen oxide (NOx) sensors to monitor the amount of NOx in the engine’s exhaust gas. The first sensor is located at the outlet of the turbocharger and monitors the engine out NOx level. The second NOx sensor is located between the selective catalytic reduction (SCR) and the diesel particulate filter (DPF) and ...Typically an electronic air shut off gets its RPM signal from the crankcase sensor; however for 3.0 they had to disable that part of programming because getting to the sensor requires major dismantling of the components around the engine. This is an older thread, you may not receive a response, and could be reviving an old thread.Home » 2017-2024 6.6L Duramax L5P Installation. 2017-2024 6.6L Duramax L5P Installation. Click here for 2017-2024 Duramax L5P Installation (PDF) About. Dr Performance started out in the small town of Harrison, Idaho in 1995. After moving to Weatherford, TX for a short time we now reside in Kellogg, and Coeur d'Alene, ID.2021 Chevy 3500 6.6 Duramax. 3900+ miles DEF Sensor engine code. Dealer had for over a week. 13000 miles NoX Sensor issue, have taken to dealer 3 times and still no fix. 1st time dealer had 1 week ...NorskeNY, when it checks the 'result' at sensor 2 and determines the NOx was not reduced as expected it then assumes the def is 'poor quality'. This is why a faulty sensor results in the poor def message. 2023 LZO CC std box 4x4. previous: 2021 LM2 CC std box 4x4 ; '18 2500 L5P CCSB 4x4; '11 LML, '10 LMM and 04.5 LLY.

L5P DEF Injector and NOX Sensors. Hello, I have a stock 2018 L5P 140k miles and am getting code P20EE. I have replaced both nox sensors and def injector with no change in nox performance, reset sensors with snap on scanner. At highway speeds nox1 is usually around 200-300ppm and nox 2 is almost always higher, rarely even with 1 and sometimes as ...2017 Chevrolet 2500 L5P Duramax position 2/ downstream NOx sensor replacement 2018 2019 2019 when reading these sensors they should show a constant slowly changing NOx …Aug 16, 2023 · Replacing the rear nox sensor on a 2017 chevy silverado 2500 6.6 l5p duramax turbo diesel. Ask the Diesel Experts. Email Us Get answers from the pros. 920-361-7700 Mon-Fri: 8am - 5pm (CST) Sat-Sun: Closed. Fits: 2017-2019 GM/Duramax.In a previous video (link below) I detailed the service regeneration procedure. This video shows you the diesel particulate sensor (a.k.a. Particulate Matte...Check out this Service Reset & Relearn where Jason Gabrenas will show you how to replace and reset a nox sensor on a Chevy® Silverado® using a Snap-on® OBD2 ...

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$14016. FREE delivery Saturday, May 11. Ships from: Amazon. Sold by: Amazon Warehouse. Other sellers on Amazon. New & Used (14) from$14016 & FREE …2017 L5P nOX sensor removal. position 2. I'm at a loss. I have been trying for hours to remove this sensor. It wont budge. Seems to be some temp sensors right next to the sensor. Working around those sensors. Any help or reference to a video on how to get it removed would be great. 0. 1 Share.May 18, 2020 ... SCN coding/programming is needed for a new NOx sensor... A trip to the dealer will be needed in your case. If you buy a good used one that has ...Exhaust and tuned. From Google search (and learned something myself since i'm not familiar with tuning an L5P): "L5P Plugs will replace the nox and def module when the exhaust/def is removed from the L5P for racing. They will keep the CAN-BUS alive to the fuel tank and maintain normal ECU operation for fuel tank/lift pump data.13 posts · Joined 2017. #1 · Sep 17, 2018. Is anyone else having issues with the 2017 and 2018 l5p duramax? I work for a company that leased probably around 30 Silverado 3500s. And I've seen one truck with 52 miles on it with 2 bad injectors, multiple issues with regen not working from sucked in air filter to a plugged def injector.

Jan 22, 2022 · 1824 posts · Joined 2020. #5 · Jan 22, 2022. NOX sensor 2. It's going to be bolted to the passenger side frame rail in front of the rear tire.. Square silver box with wires going to the exhaust system.. I have a 2015.5 Chevy 3500 single rear wheels. Bought a 2021 Chevy Silverado 3500 HD SRW, CC 4x4 with the L5P in April. Back to the dealer @ 3600mi with cel and code P20ee. They diagnosed with “ Nox sensor, false reading” reflashed the ECU and cleared the code. A week and 150mi later cel and same code (now reads as a permanent code). They’ve had it for a week now, got GM engineering ...Dasbecan 68210084AA Nox Nitrogen Oxide Upstream Sensor Compatible with Ram 2500 3500 4500 5500 6.7 2013-2018 Cummins 6.7L Replace# 904-6030 dummy ACDelco GM Original Equipment 12680215 Nitrogen Oxide SensorNorskeNY, when it checks the 'result' at sensor 2 and determines the NOx was not reduced as expected it then assumes the def is 'poor quality'. This is why a faulty sensor results in the poor def message. 2023 LZO CC std box 4x4. previous: 2021 LM2 CC std box 4x4 ; '18 2500 L5P CCSB 4x4; '11 LML, '10 LMM and 04.5 LLY.NOx Sensor 1 and Sensor 2: Functions and Differences. The NOx sensor 1, positioned upstream of the diesel particulate filter (DPF), monitors the amount of nitrogen oxide in the exhaust gas directly after it is produced during combustion. This sensor plays a pivotal role in adjusting engine settings to control NOx output.GM OEM L5P Nitrogen Oxide Sensor (NOx SENSOR) (Upstream) (2020-2023) (0) Reviews: Write first review. SKU: 12708005. Fits: 2020-2023 GM/Duramax Pricing: $178.31. Qty: Add to Cart Add to Wishlist. Item Inquiry Tell a Friend. Description; Details; Shipping; Reviews; Description. OEM Replacement Upstream (Position 1) NOx sensor. This NOx …May 12, 2021 · 2/4/21 - P20EE NOX Sensor #1? 3/28/21 - P22FE NOX sensor #2? 4/3/21 - P22FE 4/13/21 - P20EE 4/25/21 - P20EE 5/4/21 - P11DC 5/10/21 - P22FE These almost appear to me that they could be injector related, no? Do you know if any of this is covered under the PT Warranty? Thanks in advance for any helpful info. Nervous Diesel Newb, Ron L5P engines are less prone to problems, while LML700 engines have less power output and exhibit many issues, including DEF pump failures and NOx sensor malfunctions. The L5P engine is a more valuable choice because it is the latest model, much improved, and its spare parts are readily available in the market.Mar 19, 2022 · as with all my videos i try to give the most information in the least amount of time as possible so i don't waist your time. in this video i go over how to r... If you’ve ever wondered about the inner workings of your vehicle, one component that plays a crucial role in its performance is the speed sensor. In most vehicles, the speed sensor...

Duramax L5P Engine Problems. MAP Sensor Failure. Allison 1000 Transmission. Fuel Injector Failure (#4 Injector) Finding 3 problems with the L5P was difficult. While these engines are still relatively new, …

NOx Sensor, Position 1, Upstream. Fits 2018-2019 Silverado/Sierra 2500HD/3500HD L5P NEW L5P Duramax DPF Front Upstream NOx Sensor | 12708005, 12695881 | 2020-2022 GM Duramax 6.6L NEW L5P Duramax DPF Rear Downstream NOx Sensor | 12708006 | 2020-2022 GM Duramax 6.6L 17+ L5P 6.6L Duramax Diesel Particulate Filter (DPF) | 1 Year Warranty | 2017+ GMC / Chevy Duramax L5P 6.6L wanderer69 Discussion starter. 15 posts · Joined 2012. #1 · Apr 28, 2022. Have 2019 3500 Duramax with 73k on the mileage that I had a check engine light come on. Dropped it off at the Chevy dealer yesterday and they have notified me that it was a bad #1 Nox Sensor. Problem is they don't have it in stock and are on backorder with no date in stock.There are two NOx sensors in an HD truck’s aftertreatment system, one on either side of the SCR. The inlet sensor measures the nitrogen oxide (NOx) levels in the exhaust before it passes through the SCR and reports this data to the ECU. Based on this, the ECU determines how much DEF the doser should inject into the exhaust gas.The automobile fault code P20EE indicates a problem with the SCR NOx Catalyst Efficiency. The estimated repair time for this issue is 1.0 hour. The cost of fixing this issue can vary depending on the auto repair shop, but it is common for them to charge between $75 and $150 per hour. Other factors that may influence the cost include the ...L5P emissions. Contrary to a few who say there hasn't been any issues, there are numerous on other threads. "Check engine light on, again" The threads are just spread out, my fault too for not looking deeper on forum. 2018 Chevy LTZ, 4X4 DblCab SB, Duramax, Graphite Metallic, Leather, BFG LT285/65R18's,nav, Husky floor mats, WeatherTech splash ...Hey, gents. I have a '17 3500 that's recently throw the "Service Emission" message with a countdown to 65 mph speed limit along with a CEL. The codes from my generic reader are the following: P2ADA: "Reductant Tank Temperature Sensor 2 Circuit Performance". P11D3: "NOx Sensor 1 Exceeded Minimum Learning Limit".Ask the Diesel Experts. Email Us Get answers from the pros. 920-361-7700 Mon-Fri: 8am - 5pm (CST) Sat-Sun: Closed. Fits: 2017-2019 GM/Duramax.

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Jul 11, 2022 · I assume dp is differential pressure sensor. Unsure if programming is needed for that. 2019 3500HD, Cclb, Drw, Deleted and Tuned, Wehrli turbo horn, intake, boost tubes, Banks idash, S&B map spacer, VSE fuel filtration, 5 inch exhaust. The NOX sensor require a relearn/reset. Higher end scan tools have this capability. 1824 posts · Joined 2020. #5 · Jan 22, 2022. NOX sensor 2. It's going to be bolted to the passenger side frame rail in front of the rear tire.. Square silver box with wires going to the exhaust system.. I have a 2015.5 Chevy 3500 single rear wheels.2. The sensor module for NOX2 is to the rear of the Fuel Filter (as opposed to the module for the Particulate Matter Sensor, which is forward of the Fuel Filter). 3. The original part number for NOX2 is 12641557. It has been replaced by an updated part - number 12662659.I used my Banks iDash to see that it is a P20EE code, which means, "P20EE: SCR NOx Catalyst Efficiency Below Threshold Bank 1". I did a bit of research and found that there are two NOx sensors, one just after the turbo and one after the SCR catalyst. There has been a rash of the first sensor failing.L5P DEF Injector and NOX Sensors. Hello, I have a stock 2018 L5P 140k miles and am getting code P20EE. I have replaced both nox sensors and def injector with no change in nox performance, reset sensors with snap on scanner. At highway speeds nox1 is usually around 200-300ppm and nox 2 is almost always higher, rarely even with 1 and sometimes as ...The fault code P2BAA indicates a problem with the NOx sensor circuit. The diagnosis involves checking the wiring and connections of the sensor, as well as the sensor itself. The estimated repair time for this fault code is 1.0 hour. The fixing cost will depend on the hourly rate of the auto repair shop, which can range from $75 to $150 per hour.Diesel Particulate Filters DPF, Diesel Oxidation Catalysts DOC, Selective Catalytic Reduction SCR - Emission Sensors: NOX, EGT, O2, Particulate Matter, Pressure - Nitrous Oxide (NOx) Sensors; Chevy/GMC Duramax Parts - 2017+ Chevy/GMC Duramax L5P 6.6L Parts - Diesel Particulate Filters, DOCs, SCRs | 2017+ Chevy/GMC Duramax L5P 6.6LNox Player is a powerful Android emulator that allows users to run mobile apps and games on their computers. Whether you are a gamer looking to play your favorite mobile games on a...P20EE: SCR NOx Catalyst Efficiency Below Threshold Bank 1. 2013 GMC Sierra Duramax with 100,000 miles. Went on vacation to Florida from East Texas pulling my 30 TT. All ran fine and pulled great. On the trip home on Friday the engine light came on and stayed on the whole trip. Once we got home and got unhooked and unloaded, the engine …PIP5453A 2017 6.6L Duramax (RPO L5P) NOx Sensor Parts Restriction Has Ended Models Brand: Model: Model Years: VIN: Engine: Transmissions: from to Chevrolet Silverado 2017 All All 6.6 L5P All GMC Sierra 2017 All All 6.6 L5P All Involved Region or Country North America Additional Options (RPO) 6.6 L5P ConditionAre you looking for a reliable and versatile Android emulator? Look no further than Nox Player. With its range of features and user-friendly interface, Nox Player is the go-to choi... ….

The ECM sets a DTC when a serial data message is received from the NOx sensor module. The Diagnostic Trouble Code (DTC) will be set if the ECM software detects a fault in the NOx sensor circuitry or a performance fault in the NOx sensor for greater than 2 s. P11CC Code - Nox Sensor 1 Performance Signal Low.NOx Sensor, Position 2, Downstream Fits 2020-2022 Silverado/Sierra 2500HD/3500HD L5P Part# DMAX-8006 Replaces GM Part#12708006 *Contact us for current lead times* OEM Replacement Downstream(Position 2) NOx sensor. This NOx sensor is located downstream in the exhaust system. GM Replacement Part#12708006 Note: Reset procNov 3, 2017 ... 2017 Duramax 6.6 L5P Nox Sensor Replacement. Drews Shop Life•14K ... How to fix a NOX Sensor DIY for $10 on any diesel engine without ...#1. We were driving down a steep grade using the exhaust brake yesterday and got a CEL. I used my Banks iDash to see that it is a P20EE code, which means, " …L5P NOx Sensor, Upstream (2017) Part# DMAX-8675. $262.93. - +. Add to Cart. WARNING: Cancer and Reproductive Harm - www.P65Warnings.Ca.Gov. NOx Sensor, Position 1, Upstream. Fits 2017 Silverado/Sierra 2500HD/3500HD L5P. Part# DMAX-8675. Replaces GM 12718675 or 12676705. *Contact us for current lead times*NOx Sensor, Position 2, Downstream. Fits 2017-2019 Silverado/Sierra 2500HD/3500HD L5P. Part# DMAX-8676. Replaces GM Part#12676706 and 12718676. *Contact us for …Using portable 5 gas for SCR Diagnostics NEW L5P Duramax DPF Front Upstream NOx Sensor | 12708005, 12695881 | 2020-2022 GM Duramax 6.6L NEW L5P Duramax DPF Rear Downstream NOx Sensor | 12708006 | 2020-2022 GM Duramax 6.6L 17+ L5P 6.6L Duramax Diesel Particulate Filter (DPF) | 1 Year Warranty | 2017+ GMC / Chevy Duramax L5P 6.6L L5p nox sensor, For 2017-2024 Chevy/GMC 2500/3500 6.6L L5P. Ships 2-3 days. MSRP $76.76. $69.00. 5 out of 5 star rating. 63 Reviews. Add To Cart. Free Shipping on orders over $250 (48 Contiguous US)*. Protect your Duramax L5P MAP sensor from dirty exhaust gas and sticky oil buildup with Banks’ MAP Sensor Spacer., L5P engines are less prone to problems, while LML700 engines have less power output and exhibit many issues, including DEF pump failures and NOx sensor malfunctions. The L5P engine is a more valuable choice because it is the latest model, much improved, and its spare parts are readily available in the market., U029E-00. U029D00 - Lost communication with NOX sensor A. U029D. U029D00 - Communication with nox sensor has a malfunction. U029D - Fault in Communication with the DeNOX system. U029D-00. U100600 - NOx sensor 1 Bank 1 - No Communication. 28992 U029E00 Communication missing incorrect. 053302 - NOx Sensor 1 Bank 2., The assembly uses two NOx sensors: the first sensor (referred to as NOx sensor 1) is located near the turbo downpipe and measures engine out NOx. The second sensor (referred to as NOx sensor 2) measures NOx levels exiting the SCR catalyst. The SCR assembly contains a catalyst brick that requires DEF, or diesel exhaust fluid, for activation., The automobile fault code P20EE indicates a problem with the SCR NOx Catalyst Efficiency. The estimated repair time for this issue is 1.0 hour. The cost of fixing this issue can vary depending on the auto repair shop, but it is common for them to charge between $75 and $150 per hour. Other factors that may influence the cost include the ..., Apr 9, 2013 ... ... nox sensor recall and I thought to myself but I'm deleted. Isn't that sensor on the exhaust? cuz I'm straight piped And how do you replace a ....., If you can access codes from the NOXS-A, then the U029D code is either intermittent or a memory code. If unable to access the NOXS-A, then the U029D code that the other modules are setting is active, and the problem is there now. The most common failure is a circuit fault which causes the loss of power or ground to the nox sensor a., Ask the Diesel Experts. Email Us Get answers from the pros. 920-361-7700 Mon-Fri: 8am - 5pm (CST) Sat-Sun: Closed. Fits: 2020-2023 GM/Duramax., Sep 4, 2015 · Dasbecan 68210084AA Nox Nitrogen Oxide Upstream Sensor Compatible with Ram 2500 3500 4500 5500 6.7 2013-2018 Cummins 6.7L Replace# 904-6030 dummy ACDelco GM Original Equipment 12680215 Nitrogen Oxide Sensor , 2021 Chevy 3500 6.6 Duramax. 3900+ miles DEF Sensor engine code. Dealer had for over a week. 13000 miles NoX Sensor issue, have taken to dealer 3 times and still no fix. 1st time dealer had 1 week ..., If you can access codes from the NOXS-B, then the U029E code is either intermittent or a memory code. If unable to access the NOXS-B, then the U029E code that the other modules are setting is active, and the problem is there now. The most common failure is a circuit fault which causes the loss of power or ground to the nox sensor b., Aug 30, 2021 ... 2016 Cascadia DD15 Nox sensor issue spn 3238 fmi 2! After treatment problem! · 2017 Duramax 6.6 L5P Nox Sensor Replacement · 2012 Cascadia ..., , May 18, 2020 ... SCN coding/programming is needed for a new NOx sensor... A trip to the dealer will be needed in your case. If you buy a good used one that has ..., - - L5P - Silverado 2500/3500 HD 2020 2021 GMC Sierra 2500/3500 2017 2019 Sierra 2500/3500 HD 2020 2021 Involved Region or Country North America and Israel ... reduction by looking at the NOx 1 and NOx 2 sensor readings. The ECM also looks at other sensors to predict what the NOx reduction should be. Certain things can influence, This condition may be caused by a damaged NOx2 sensor, as shown in the graphic above. Correction If the sensor is found to be damaged, replace the NOx 2 sensor Service Procedure Refer to Nitrogen Oxides Sensor Replacement - Position 2in SI. Parts Information Causal Part Description Part Number Qty X SENSOR, NOX (POSN 2) 12695882 1, Aug 16, 2023 · Replacing the rear nox sensor on a 2017 chevy silverado 2500 6.6 l5p duramax turbo diesel. , GM OEM L5P Nitrogen Oxide Sensor (NOx SENSOR) (Upstream) (2018-2019) (0) Reviews: Write first review. SKU: 12718742. Fits: 2018-2019 GM/Duramax Pricing: $194.63. Qty: Add to Cart Add to Wishlist. Item Inquiry Tell a Friend. Description; Details; Shipping; Reviews; Description., Don't forget to Like and Subscribe for more! - https://goo.gl/XtV9CJCheck out our Merch! - https://thedieseler.myteespring.co/O2/NOx Sensor Socket - https://..., S&B MAP Sensor Spacer Installation for 2011-19 Ford 6.7L Powerstroke. Watch on. The amount of soot that builds up on the L5P MAP sensor is unreal. Our MAP Sensor Spacer keeps your sensor clean and one less thing to worry about., L5P emissions. Contrary to a few who say there hasn't been any issues, there are numerous on other threads. "Check engine light on, again" The threads are just spread out, my fault too for not looking deeper on forum. 2018 Chevy LTZ, 4X4 DblCab SB, Duramax, Graphite Metallic, Leather, BFG LT285/65R18's,nav, Husky floor mats, WeatherTech splash ..., FWIW, NOx sensors monitor the level of NOx in the exhaust, before and after the treatment process that uses the DEF. All of this is downstream of the engine, so driveability is not affected. ... Sold 2021 LM2 Sierra 4x4 crew 6.5 box, 2018 L5P Sierra 4x4 SB, 2011 LML Sierra 4x4 CCSB, 2010 LMM, 2004.5 LLY. Save Share. Like. D. Dmax310 …, P0191 fuel rail sensor. Alright guys, I've had this engine code for awhile, and never thought it was anything, CTS says the pressure was fine until recently. The light only comes on when at idle, and the fuel pressure goes from 4.4k to 5.0k at idle. It's audible too, the engine goes from 640rmp to about 660 so I'm think it's the regulator., L5P Exhaust Particulate Sensor (2017-2019) Fits: 2017-2019 Chevy/GMC Silverado/Sierra 2500/3500. Part# 12685369. This GM Original Equipment Diesel Exhaust Particulate Sensor is a GM-recommended replacement. This original equipment sensor will provide the same performance, durability, and service life you expect from General Motors., Chevy / GMC Duramax 2017+ L5P Forums. 2017-19 GM T-K2 Platform Powertrain Spare NOX sensor? Jump ... When I took my truck in for the Nox sensor CEL, the diesel tech ..., In today’s rapidly advancing technological landscape, businesses and organizations are constantly seeking innovative ways to improve efficiency, productivity, and overall operation..., Diesel Particulate Filters DPF, Diesel Oxidation Catalysts DOC, Selective Catalytic Reduction SCR - Emission Sensors: NOX, EGT, O2, Particulate Matter, Pressure - Nitrous Oxide (NOx) Sensors; Chevy/GMC Duramax Parts - 2017+ Chevy/GMC Duramax L5P 6.6L Parts - Diesel Particulate Filters, DOCs, SCRs | 2017+ Chevy/GMC Duramax L5P 6.6L, In today’s advanced automotive industry, sensors play a vital role in ensuring the smooth and efficient operation of vehicles. These sensors are responsible for collecting data and..., In today’s rapidly advancing technological landscape, businesses and organizations are constantly seeking innovative ways to improve efficiency, productivity, and overall operation..., L5P DEF Injector and NOX Sensors. Hello, I have a stock 2018 L5P 140k miles and am getting code P20EE. I have replaced both nox sensors and def injector with no change in nox performance, reset sensors with snap on scanner. At highway speeds nox1 is usually around 200-300ppm and nox 2 is almost always higher, rarely even with 1 and sometimes as ..., Oct 13, 2019 ... My 2020 Duramax had less that 500 miles on it when the engine light came on. Took it in twice for the same code and it was recalibrated, ..., Fits 2017 Silverado/Sierra 2500HD/3500HD L5P. *Contact us for current lead times*. OEM Replacement Upstream (Position 1) NOx sensor. , 2017 Silverado, L5P w/81K miles. Starting to get code P20EE which suggests a "low catalyst efficiency". I can clear the code with my Edge and drive for a certain number of miles without the code reappearing- but, it eventually returns. I've seen some owners claim the #2 NOx sensor or the DEF injector may be the culprit.