Hi, I hope You are all well.

I have an issue with Lambda on My 996 Gt3 Cup. It is fitted with and Motec M600 Ecu. I am now getting the Car ready. Have only been doing a few Laps so far and found out that the Lambda sonde on the left hand side is indicating "fault"
The fault is on the Motec Dash display and when I connect the Laptop it says the Left hand Lambda is alternating Heating and "fault'

My Trouble shouting:
- Inter changed the Lambda Left hand to Right Hand -> The fault stays on the left
- Measured "No/normal resistance" in the wires between the Ecu and Lambda
- Measured connection in the wires between the Ecu and Lambda
- Doing and manual/eternal measuring in the exhaust the left hand Lambda indicating very lean however it runs very fat on the left hand side.

So just ti recap: Left hand Lambda is sensing Lean and make the Ecu adjust to fat

Any good advises how to fix this problem and or/ what it can be Please?

Thanks a lot for Your help in advance:-)

Best regards,

Sune