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[Tezzyd]

I keep getting 2 fault codes coming up when i drive far, say over 50 miles:( :

P0155 O2 sensor heater circuit malfunction (Bank 2 Sensor 1)

P0170 Fuel trim malfunction (Bank 1)

Can anyone tell me which sensor this would be, as i have one either side of the cat, and would this cause the fuel trim malfunction. Or could it be something else that would cause this error to crop up.

[Welung666]

Slight problem as you don't have a bank 2 being a 2.2, only the V6's have a bank 2. Are you sure on the codes?

Fuel trim is normally one of three things. MAF faulty, one of the 02 sensors faulty or the cats have had it.

Get the codes double checked

[Tezzyd]

My mistake, the code is P1555, which is more confusing as it's not even on the list on here.  The cat is new.

[aaronjb]

According to Google.. P1555 is "Fault - Throttle position sensor, AFM, implausable signal."

As in the ECU is comparing the throttle position sensor input with the registered volume of air from the AFM and concluding that you can't possibly have X throttle deflection with Y volume of air unless something is very wrong..

So either a faulty AFM or faulty TPS (or wiring fault)..

According to Google, anyway

[davethediver]

Take throttle bodies off give them a good clean and the breathers as well and see if this cures it. Worked for me  if that dosen't work as said could be a possible MAF fault but try that first

[PhilRich]

I keep getting 2 fault codes coming up when i drive far, say over 50 miles:( :

P0155 O2 sensor heater circuit malfunction (Bank 2 Sensor 1)

P0170 Fuel trim malfunction (Bank 1)

Can anyone tell me which sensor this would be, as i have one either side of the cat, and would this cause the fuel trim malfunction. Or could it be something else that would cause this error to crop up.

Hi mate Don't know whether you already have it or not? but here is the Fault Code list for the 2.2 Z22XE Engine 

http://www.omegaowners.com/forum/YaBB.pl?num=1197277611

[Tezzyd]

Thanks for all the replies, I will give the throttle body and pipes a clean as the butterfly valve could be sticking when very hot. I will let you know the result soon.