09-23-2020, 01:35 PM | #1 |
First Lieutenant
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Lambda/O2 sensor failure
Hi everyone,
My dad has a 218d which has just experienced a lambda/o2 sensor failure. The car is a 2017 model so just in warranty (thankfully) and has done 16,000 miles since new. The car was serviced and passed its MOT last week so this is a bit of a surprise. Any ideas about what might cause a failure of this type / might this mask a more serious problem? I would have thought that a dodgy sensor would have affected the emissions causing an MOT failure last week, so to have this happen literally 6 days after the MOT is strange... Any input/thoughts welcome. Are there any questions I should ask the garage (who have been good I must admit)? |
12-07-2020, 09:23 AM | #2 |
First Lieutenant
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is that down upstream or downstream sensor?
my downstream sensor failed and I replaces it with a part off Amazon for about $30? I also picked up an o2 sensor removal tool which allowed me to do it in about 20 minutes. from what I read, O2 sensor technology has not changed really ever and the cheap parts are just as robust and work just as well as the expensive parts. it's been about a year and a half and I've had zero issues on the new part. |
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12-07-2020, 09:41 AM | #3 |
Major General
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I think ( I did read ) that if you were detailing the engine bay with the car running and spraying silicone based spray to rejuvenate or spraying some exterior spray waxes with silicone with a running engine - that silicone can mess up lambda sensor or mass air flow sensors.
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12-07-2020, 10:32 AM | #4 | |
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Quote:
It is also has been a problem with a lot of the cheap Amazon and eBay sensors that they are counterfeit or poor quality knock-offs that may quickly fail or not function properly at all, best to determine the OEM sensor manufacturer (Bosch, NGK/NTK, Denso, etc) and use a parts cross reference to purchase the equivalent at a reasonable cost from companies such as Rock Auto. |
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12-07-2020, 01:52 PM | #5 |
First Lieutenant
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What happened here as it turns out was an EGR valve failure which took out the o2 sensor. All replaced under warranty (dad had about 4 days warranty left at the time of the failure!)
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