Well, I haven't done a thing to poor Nigel and his blown head gasket.
I have been driving Winston, my 2001 D2 that I bought for $1500, for 11 months now. I have put 2222 miles on him. A few days ago, the CEL came on with a code of P0133, O2 Bank 1 Slow Response. Pack rats like to put cactus buds on the top of the engine, so I cleaned it and cleared the code. A few days later, I decided to pressure wash the engine. I wasn't surprised when the CEL came on, just figured connections would dry out eventually. Cleared codes and drove it again.
Oops.
CEL on. Among the usual codes P1300, P0301, P0303, P0305, P1319, P1129, there is P0134. Now this seems suspiciously like a left bank O2 problem. I don't think it is coil packs, because it is one side only. Could be a bad wire in the harness, bad connection at the sensor, the O2 itself, or worse. Any experience with this? Going outside to trace wires from O2, and clean and dielectric grease the O2 connector.

 

Disconnect the sensor to test, disconnected sensor won't cause misfires, just throw a sensor code.

 

Thanks Extinct, I found this article and plan to do it.
https://www.motor.com/wp-content/upl...eater_0716.pdf