mike sharples

I thought I had this problem beat , had P0421 code come up weekly for months , haven't had check engine light on or any codes for 13 weeks, yesterday it came back, with P1457,exh temp sensor 2 op. circ. I plugged in a scanner, KOEO, monitor exh temp, and four o2 sensors . Start engine, all at .43 volts, after aux air pump had switched off,o2 sensor bank one stays at around .48v,o2 sensor 1,bank 2 switching .09v to .75v.Both rear sensors seem to stay around .43v moving slowly around that point. Only ran engine for about 3 mins.Does this look like an o2 sensor failure? Car starts and runs mint, loads of power etc. I hate check engine lights on, anybody got any ideas...

indoor

That's an EGT code.
Pricey Audi All Road 2.7T Exhaust Emissions EGT Sensor - 078998124B - Exhaust Gas Temperature Sensors (EGT) - Set Of Two - ES#284160

I would search around the forums, though before throwing expensive parts at the car

mike sharples

found the passenger side flex pipe leaking,first time I heard it this last weekend,on inspection it was shot thru,so is the drivers side,tho it doesn't make a noise yet,must be the stainless wrap..gonna get them changed and will see what happens

JustMtnB44

A leaky flex pipe will cause this code, it doesn't take much of a leak either. I recently replaced mine to address this same problem, although they were completely broken.

amiram

chack o2 sensor 1 bank 2 Heating element

crono35

the exhaust temp sensor often fails because the soldering inside the box is bad. Relatively easy fix if that's the case. I repaired mine on the car and it took about 15 minutes, most of it spent clearing away the anti-moisture gel.

mike sharples

thanks for that,will check out the electrics soon,had egt sensor op circ codes for months,they clear straight away and don't come back for weeks/months...a dry joint will do that...