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The heater and the sensor are not the same thing.
Upstream and downstream sensors do different things. There's no need to replace both sets at the same time.
So Mullusc, The Rave talks about a heated O2 sensor so i was wondering this is the same as the Lambda sensor. Rave: The heated oxygen sensor is an integral part of the exhaust emission control system and is used in conjunction with
the catalytic converters and the engine management control unit to ensure that the air:fuel mixture ratio stays around
the stoichiometric point of λ = 1, where the catalytic converters are most effective. Combinations of four (NAS only)
or two heated lambda sensors are used in the exhaust system dependent on market legislation.
Remove both sensors and install them on the side opposite where they were previously installed.
If the fault code "follows" the sensor to the other cylinder bank, the problem is most likely a defective sensor that needs to be replaced.
If the fault code remains on the cylinder bank where it appeared originally, the problem is most likely a real defect with another component. In the case of the downstream, post-cat, Position 2 sensors, that means the catalytic converter. In the case of the upstream, Position 1 sensors, it can indicate several, different possible problems (vacuum leak, defective MAF, etc.).
Upstream and downstream sensors are different from each other, and are not interchangeable.
mln is right -- an O2 sensor and a Lambda sensor are the same thing; however, you were asking about the heater error and the lambda sensor error. Each O2 sensor has a heater circuit as well as a sensor circuit. So the two errors are different, but derive from the same component. (Or the same wiring issue, which is what ml is attempting get you to diagnose.)
It might also make sense to mention that I had another O2 sensor code a while ago - P0155 (Bank 2, Sensor 1) - that's the opposite bank from the code I saw more recently. It hasn't come back. Not sure why exactly. Would this indicate anything else? In that bank, would it make sense to replace the sensor or at least swap it with the other and see what happens? That code hasn't presented since Nov 2020.
Here's something else - one of the clips on the air filter box cover that connects to the MAF pipe is cracked and the other is just broken off. Should I replace it? I don't know if this is causing an issue. I think I should also mention that I used CRC MAF sensor cleaner recently to try to clean the wire.
Last edited by neuropathy; Apr 25, 2021 at 08:01 PM.
The broken tabs on the intake lid won't be causing any codes, as that part shouldn't affect any sensors. You can replace it so that your intake air is all drawing through the filter, but it won't fix your problems.
I always avoid trying to clean a MAF. Far too easy to get the cleaner into the wrong place and ruin it.
If you are looking for a replacement, would suggest you reach out to Paul Grant. He is in CT and I have purchased a number of used parts from him. paulgrant@mac.com. Be specific as to Rover year etc.
