Nox Sensor Troubleshooting? | UK Volkswagen Forum

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neeps N Hi. I have a Golf MK5 1.6 FSi BAG which repeatedly makes the MIL light to go off, and have seen DTC fault codes reporting NOX related messages. A reset was done recently, and I have therefore not recorded the last error codes. However I still suspect that the NOX is the culprit, due to occurring several times prior. Once the MIL light goes off, I experience poor acceleration in general and especially uphills. However, I am still able to drive at motorways and it runs fine once a reset is done for a couple of miles. Is this expected behavior, if dealing with a faulty post cat NOX sensor? Reason I'm wondering, is due to the insane price of 800€ in Norway. I don't want to buy a part that might not be faulty at all, especially not at that price. Customer service for this retailer, mentioned that even if I receive fault codes for the sensor it might not be the culprit. The Oxygen sensor might be the faulty part, I was told or just broken circuits. My NOX sensor haven't been replaced at all, it's part number is: 03C 907 807 A, and product date: 34/03. Been looking at junkyards for the part, but haven't found any yet. How can I be certain that the Nox sensor is faulty? and what's the easiest way to troubleshoot it? Thanks in advance for any help. #1 · Jul 27, 2016 (Edited) Hi. I have a Golf MK5 1.6 FSi BAG which repeatedly makes the MIL light to go off, and have seen DTC fault codes reporting NOX related messages. A reset was done recently, and I have therefore not recorded the last error codes. However I still suspect that the NOX is the culprit, due to occurring several times prior. Once the MIL light goes off, I experience poor acceleration in general and especially uphills. However, I am still able to drive at motorways and it runs fine once a reset is done for a couple of miles. Is this expected behavior, if dealing with a faulty post cat NOX sensor? Reason I'm wondering, is due to the insane price of 800€ in Norway. I don't want to buy a part that might not be faulty at all, especially not at that price. Customer service for this retailer, mentioned that even if I receive fault codes for the sensor it might not be the culprit. The Oxygen sensor might be the faulty part, I was told or just broken circuits. My NOX sensor haven't been replaced at all, it's part number is: 03C 907 807 A, and product date: 34/03. Been looking at junkyards for the part, but haven't found any yet. How can I be certain that the Nox sensor is faulty? and what's the easiest way to troubleshoot it? Thanks in advance for any help. See less See more Sort by Oldest first Oldest first Newest first Most reactions #2 · Jul 27, 2016 Welcome to the forum. What are the actual error codes? #3 · Jul 30, 2016 I have received: 17441 : - sensor for nox (G295) P1033 - 002 - signal too low - intermittent p2202 : Nitrogen Oxide Sensor (NOx) Sensor Circuit Low Input Bank 1 Also received a couple of faults causing MIL lamp to light, would love some advice on this: 05409: Intake Manifold Valve 2 N261 - electrical fault in the circuit 18354: Control Module 1 for Coolant Fan: Defective #4 · Jul 30, 2016 (Edited) Hi, and thank you I have received these fault codes: 17441 : - sensor for nox (G295) P1033 - 002 - signal too low - intermittent 18634 - NOx sensor circuit low input bank 1 17479 - NOx Sensor (G295) Heater Control: Implausible Signal P1071 - 004 - No Signal/Communication - MIL ON Also received a couple of faults causing MIL lamp to light, would love some advice on this: 05409: Intake Manifold Valve 2 N261 - electrical fault in the circuit 18354: Control Module 1 for Coolant Fan: Defective 07346 (?) #5 · Aug 2, 2016 (Edited) Hi, and thank you. Not sure what happened to the post i edited. But i'll write it again. The actual errors codes for my car are: 17441 05409 18354 18320 07346 17479 p2202 (another tool) Reported with a cheap vagcom tool i picked up from eBay. Not sure how accurate it is, some of the codes i can't find any info about. 17479 - NOx Sensor (G295) Heater Control: Implausible Signal P1071 - 004 - No Signal/Communication - MIL ON 18354 - Control Module 1 for Coolant Fan P1946 - 000 - Defective 17441 - NOx Sensor signal too small 05409 - Intake Manifold Valve 2 - N261 electrical fault in the circuit P2202: Nitrogen Oxide Sensor (NOx) Sensor Circuit Low Input Bank 1 #6 · Aug 2, 2016 I've never heard of 05409 07346 but all the other codes are in my EOBD II Fault Codes Software Cheap fleabay cables aren't accurate get yourself a genuine VCDS cable? VCDS #7 · Aug 2, 2016 Will consider buying one. However, do you think it's likely that the nox sensor control unit may need to be replaced? Heard it's normal to have a problem with it on 1.6 FSi engines. #8 · Jul 23, 2020 Hey Friends, I have a 54 plate A3 1.6 FSI and faced NOx Sensor error issue. I looked for the solution on internet and found an informative blog explaining all the error codes in detail. I would recommend reading it. Here is the blog https://xenons4u.co.uk/blog/p1032-p1033-p1034-p1035-dtc-error-fault-codes-explained #9 · Jul 23, 2020 I have replaced many. Insert Quotes Post Reply

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