ok so i just did the valley pan gasket new intakes upper and lower cleaned the heck out of the egr. put a used egr valve selonoid and mas air flow. Rear O2 Sensor are brand new and recently had new flex pipe welded in, ive been having some codes that cant figure out.

96 A4 Quattro 2.8 12v AFC engine code

in order on scanner

P1409 Tank Ventilation Valve Circ Electrical Malfunction

P1400 EGR Valve Circ Electrical Malfunction

P0161 O2 Sensor Heater Circuit Bank 2 Sensor 2

P0141 O2 Sensor Heater Circuit Bank 1 Sensor 2

P0155 O2 Sensor Heater Circuit Bank 2 Sensor 1

P0135 O2 Sensor Heater Circuit Bank 1 Sensor 1

 

sounds like it could be a grounding problem?

 

I would check power to the above components.

 

02 sensor codes dont come on right away i cleared them the egr and vent code comes on right away the o2 codes come on once you drive it

 

anyone? bump

 

Maybe you missed something, or damage things when cleaning the egr valve. That almost always seems to be the case for me. Ive also bumped a vacuum line once sliding my hand down the side of my old Mazda's motor while wrenching, causing it to throw a code. Id check the surrounding area where you worked to make sure you didn't accidentally bump a wire loose. Hope this helps, just throwing suggestions at ya, good luck.

 

tripple checked everything took photos of everything before taking apart everythings all in good the codes were on before i did the manifold and egr i did those things hoping to fix the problem. All of the codes came up after getting a new flexpipe welded in. Car runs great like it should actually its runnin the best since i owned it, just the codes lingering though. i tested the diaphram of egr valve to so its all good

 

You didn't happen to brake the EGR temp sensor wire while removing the intake.
Real easy to do if not careful.

 

no its still intact and in one piece the codes were there before i did the manifold. they all came after i got my new flexpipe welded in the exhaust

 

anybody?