Lost Left Hand Bank & Can’t Connect Diagnostics

Hi All,
Have been experiencing some strange hot start behavior.

Drove the car 20 minutes, pulled up, switched the car off and came back to it after a couple of minutes. Upon restart the car appeared to be running on one bank.

It did this to me a couple of weeks ago, so I left the ThinkDiag hooked up, so I could see some real time data. However what’s even more strange is all the time it was running on one bank I couldn’t connect to the car.

I drove the car up the road to see if it’d clear, and it was down on power. Eventually the slow down light came on, so I pulled over and shut the car off.

I checked the engine bay to see if either of the cats was glowing, but nothing. Went to restart the car and it ran completely normal, all the way home, and it would now connect to the ThinkDiag.

all I can think is the left hand ecu relay was playing up, or there is a bad earth to that ecu. Are there any other conditions which would cause the bank to shut down and stop diagnostic connection.

These are the codes I pulled once I could connect again.





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