Running lean tryed everything

[troyritsema]

So i have an audi a4 1.8t aeb engine and i am lost where to go now i cant get my system out of limp mode it hes a front mount intercooler stock ecu stock turbo aftermarket intake ive cleaned maf sensor cleaned throttle body no vac leaks but system runnig real lean will only boost max about 4 psi i run 93 octane i hade a leaky fuel injector seal so i replaced them all today no difference dont think there is a vac leak on vag com lite only codes i get are p0102 p1198 and p0140 i dont have a cat or post cat o2 have a brand new pre cat o2 sensor in though


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[troyritsema]

Is it possible that i have to big of a blow of valve?


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[calum]

You still need the post cat 02 sensor for the fuelling.
The only way you can run properly without it is with a remap.

Edit, AEB doesn’t have post cat sensor my apologies.

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[calum]

P0102 Mass Air Flow (MAF) Circuit Low (https://www.obd-codes.com/p0102)

P1198 O2S Heater Circuit Bank 1 Sensor 2 Electrical Malfunction (https://www.google.co.uk/amp/s/www.autocodes.com/amp/codes/p1198.html)


P0140 Audi HO2S12 Sensor Circuit No Activity Detected OBDII Engine Light Trouble Code | Engine-Codes.com (https://www.google.co.uk/amp/s/www.engine-codes.com/amp/codes/p0140_audi.html)

The best approach would be to clear the codes and see which ones come back and deal with them, hopefully some of them will be old and won’t come back.



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