All Things Mk5 > Performance Modifications
Can fit a standard cat back on to a decatted car?
owheel:
Thanks for your reply! Its interesting to hear you are in the same situation.
I thought adding an exhaust restriction would make it run rich rather than lean?
The other 2 codes look like sensor failures i think? It looks like one sensor is returning a resistance/voltage out of measurement range, and the other is simply uncontactable.
I think a thermostat failure also causes the engine to run rich as it overfuels the engine to try and bring the temperature up?
Has anyone had any experience trying to flash the stock car map onto the car. Is the dealer the best way of doing this? I have no idea the quality of the map that was added, but it's not a Revo/Apr job judging by the cheapskate downpipe job, so I'm not bothered about losing it.
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Jons1001:
Yeah to be honest I'm quite puzzled by the codes aswell. I mean for all I know it could just be a sensor like you say, and I did read somewhere that a thermostat fault can also show up as lean so if anyone else has any thoughts on this id be keen to hear. Still leaning towards adding the cat but then wouldn't it show up sooner than 3 weeks of driving?
I tried the dealer to get the car flashed back to stock but they said they couldn't (VW Canterbury). Take it you have no way of finding out who did the map then?
muff1991:
If you’re after a cheap stock cat (used of course) I might be able to hook you up, it passed the mot in January, I have just fitted a decat. I got a stock map put onto my car by a local garage who also does generic mapping, he only charged me £50.
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owheel:
@Muff1991 I am definitely interested in your cat. Where are you based. I'm also interested in what your plan is for future Mots? Are you going to swap a cat on to the car each time?
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muff1991:
--- Quote from: owheel on April 11, 2021, 07:46:29 am ---@Muff1991 I am definitely interested in your cat. Where are you based. I'm also interested in what your plan is for future Mots? Are you going to swap a cat on to the car each time?
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--- End quote ---
I’m based in Aylesbury (bucks) and I know a guy who will help me through the MOT with lending me a cat
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