Check engine message

[marilyn_monaro]

I'm aware there's lots of threads about it but can't find anything similar to what I have. I get the check engine message a few minutes after every start up, I can cancel it and it won't show again for the rest of the journey, until the car is started again. This happens whether hot or cold.

I changed both 02 sensors as it used to give me the dreaded beep lots of times but after that it settled on just once. I also changed the oil pressure sensor, a genuine one, no difference. Tried to check the code in the dash and its all zeros. Tried my code reader, still nothing.

It doesn't affect how the car drives, no lumpy idle or anything, it's more of an annoyance. Im leaning towards maf or pcv valve. Has anyone had a similar occurrance?

[marilyn_monaro]

Thanks for the replies. Yes I have an 04 so only 2 sensors. They were both genuine/ac delco, I can't recall which. All I know is they were a pig to get out lol.

Standard setup and original headers. Exhaust has been changed for stainless from cat back.

[marilyn_monaro]

I replaced the sensors around 6 months ago, and actually put a new battery on 2 weeks ago, but no change still get the message.

I'm in the West Midlands