All Things Mk5 > How to Guides / Troubleshooting
O2 sensor adaptor
briank213:
Hi everyone the mechanic just called to tell me the misfires on my car as well as the P1093 code and random misfire codes are all clear and the issue was there was a adaptor that was fitted onto downpipe where the O2 sensor fits so It was reading the exhaust gasses incorrectly and causing all the issues on my car from the fuel cuts to the car shuttering. Does anyone know what this is ?
LC5F:
Looks like a type of spacer - but with a needle hole - an attempt to reduce the sensitivity of the sensor.
briank213:
--- Quote from: LC5F on October 05, 2021, 06:14:34 pm ---Looks like a type of spacer - but with a needle hole - an attempt to reduce the sensitivity of the sensor.
--- End quote ---
ya it's some kind of cat fooler but this was installed on the turbo O2 sensor not sure why the tuner installed this on my car it caused all types of problems and threw a P1093 code ended up changing plugs, coils, plugs, hpfp, PCV valve and injectors and only to find out this was the issue on the car. After they removed it and reinstalled the sensor all the codes cleared and the car is running smooth again.
pudding:
Who ever installed that on the primary O2 should find another career, or go to college and learn how engines and engine management systems work if it was a DIY effort :doh:
They should never be used anyway as they're an utter bodge, but they go downstream of the second cat to 'fool' the catalyst efficiency check. It's basically what people fit when selling a car that has a catalyst efficiency EML. Kind of like when people used to break the ABS light to disguise an impending £1000 ABS pump replacement.
briank213:
--- Quote from: Pudding on October 07, 2021, 03:12:20 pm ---Who ever installed that on the primary O2 should find another career, or go to college and learn how engines and engine management systems work if it was a DIY effort :doh:
They should never be used anyway as they're an utter bodge, but they go downstream of the second cat to 'fool' the catalyst efficiency check. It's basically what people fit when selling a car that has a catalyst efficiency EML. Kind of like when people used to break the ABS light to disguise an impending £1000 ABS pump replacement.
--- End quote ---
Ya but I am not sure if they did this on purpose so they could make more money of me making it seem like my car had a issue on the injectors and Hpfp cause I ran out of options on things to change and now I changed all of parts for nothing. I am just happy the other mechanic found what was causing the issue on my car and now my car is back to normal. I don't feel like tuning any other car again from this experience.
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