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[JamesV6CDX]

This is the situation.

The EML is constantly flickering on my Elite. I read the codes and got 38 - lambda one voltage incorrect.

When I clear the codes, the light stops flickering until I drive for a couple of minutes, then it starts again and the code 38 comes back.

There are no other codes logged.

Thinking it may be the sensor itself, I swapped them both over this evening and went for a test drive. No new fault codes have been logged apart from the code 38, so am I right this suggests a problem with the wiring to the Lambda1 sensor, rather than the part itself?

There seems to be a crimped connector on one of the wires (loom side) for lambda 1, so a bad connection may prove my suspicion. Unfortunately access is very poor.

I'll see if I can get better access when engine is cold to re-make that connection, but any immediate thoughts on other ways forwards?

The fact that the EML is flickering constantly makes me wonder if something is earthing out - it's even flickering when flashing codes out.

Thoughts would be welcome.

[Derek_in_Penzance]

To check that it is the wire causing the problem, you could try bypassing the blue/red wire from the fuel pump relay down to lambda 1. Just run a wire from the relay down to the plug by the gearbox, ensuring that you stick the wire in the correct socket. However if the original wire is indeed earthing out you'd have to snip it somewhere (making sure you snip the right wire and not one of the other two blue/red wires that branch out from the fuel pump relay.)

Not sure if this a good idea but having just been looking at my own lambda wiring it is still fresh in my mind.

[philhoward]

I wouldn't look further until you've fixed the dodgy connection - the signal isn't very strong and i guess any sort of bad connection (where it may be intermittantly earthing out?) will affect it.

Would it be easier to drop in a new bit of cable, bypassing the whole loom section - using some screened cable, naturally! Microphone cable is apparently just the job...

[JamesV6CDX]

Interestingly when the connector was pulled the light went off for a bit.

I guess I need to trace those wires - anyone know where they all end up?

[Derek_in_Penzance]

The red/blue wires from the o2 sensors go into the main wiring harness and join up together just before the mauve fuel pump relay K44, which is the outermost of the two identical mauve relays at the back of the fuse/ECU/relay box on the inner wing. The single wire goes to terminal 87 on the relay.

There is another, single red/blue wire that goes from terminal 85 to terminal 37 on the injection ECU.

There is more...but it's difficult to describe, so best look at the wiring diagram in the Haynes manual, page 12.28, the o2 sensors are P32 and P36.

But I'm assuming that you know all this anyway! If not, I hope this is some partial help.