P0134 intermittent

[KyleT]

01 non sai. Bank 1 sensor 1 no activity. It is intermittent. New sensor (quality) initially fixed. cleaned the connector, put dielectric grease in, and moved the sensor plug away from any dripping oil/coolant. It will clear for months at a time, then come back immediately, then clear for months at a time.

Bad ecm?

Bad sensor again?

Other I'm missing?

 

[helievacpilot]

I'm thinking maybe wiring from plug to ECM?

 

[discostew]

I would check the red/blk wire from the connector back to the ecm. When the car is running the pcm supplies a ground for that. If your loosing the ground when it's acting up, give the wire its own ground on a bracket in that area. I've done that several times. Make sure you look close at the connector at the o2 sensor itself for terminals backing out of the plastic connector body.Most times an intermittent like that comes down to a poor connection.