Still the same after some cleaning, cleared CEL and it came back after a couple of minutes.

New lambda it is...

 

And it's fixed

 

CEL has returned, this time with P0135 which is to do with the heater circuit.

Any ideas anyone?

 

That sounds more like a duff wire / bad earth in the circuit if you've already changed the sensor.

 

Searchy search yielded this....

 

Any way to verify my heater driver is good?

It's also cutting out at idle, I wouldn't have thought it would do that though as the lambda voltage is still going from lean to rich.

That's talking about the secondary.

 

Well .... it's a new part! Did you crimp the wires or use the existing plug?

 

It already had the plug on it, it was a direct fit replacement.

 

I would be tracing the wire back to see if you have a break in it - also check the condition of the wires in the car part of the plug - check that the connections are nice and clean.

 

I will pull it apart tonight and give the contacts a good clean. Hopefully that resolves it.