I'm new to the board here. Thanks in advance for the advise!

I've got a 2001 Discovery II SD with 140,000 miles on it. Just had the airflow meter replaced.


I've failed emissions an had some work done to eliminate 11 of the 14 codes I had coming up. I've still got 3 codes though. They all seem to point to an o2 sensor. Is there any way to figure out which u2 sensor needs to be replaced without running any further diagnostics?

Here are the 3 remaining codes (in this order)::
P1171 Manufacturer Control Fuel Air Metering
P1174 Manufacturer Control Fuel Air Metering
P0135 o2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) (this one also says "pending" next to it...don't know what that means? It was code 3 of 3.


I'd like to fix this last problem myself. I know where the o2 sensors are and feel confident I could replace them. I just need to know exactly which 1 (or more?) actually need to be replaced.

Also...is there anything that can be done to revive a malfunctioning o2 sensor? Or do they just need to be replaced?

Thanks,

Josh

 

needs a oxygen sensor for the last code and I suspect you have an air leak for the other two codes. Either broken welds at the cat or broken hose or leaking intake gasket.