Hi,

>>> The live data told us the Lambda sensor was working <<<

That's very good but what else did it tell you?

How is the load demand calculated / is the reading correct?

What does the rest of the data tell you?


>>> 42- 02 sensor circiut <<<

What is the engine code?

What engine management system is it fitted with, Marelli, Bosch or Sagem?

I assume either Marelli or Sagem as the fault code does not exist within the bosch fault code table. (both the others have a code 42 within their fault code table)

As has been said before what testing has been done, whats the resistance of the heater circuit of the sensor?

Is the supply good?

What current is flowing within the circuit?

Carry out some testing and we can help you pinpoint your issue.

Gut feeling is the heater circuit has been shagged for a while (do you know how long the MIL has been on for?) and the extended warm up phases (before closed loop control) have killed a marginal Cat.

But I wait for your results.

Mark