Multiple, changing ECU codes

  • 4 CYL
  • 2WD
  • 126,000 MILES
So I recently got the listed above for a good deal. Okay, a really good deal, as in free.

It was running rough, with a check engine light. I replaced the igniters and plugs and problem solved.

A week later the check engine light came back on. At auto-zone they told me the light indicated replacement of the mass airflow sensor. I did so (very easy procedure BTW) and all was well. For a few days.

This time the code said that the bank 1 O2 sensor was bad. I replaced that (not as easy, but fairly straightforward) and the light went away. For a couple of days (about 500 miles, I went on a short trip).

Now another check engines light, again telling me to replace the bank 1 O2 sensor.

I'm starting to get the feeling that this might be the computer itself and not all these components I keep replacing. Currently I'm just going to pull the O2 sensor and return in (assuming I got a dud), but. Who knows.

My thoughts were to re flash the whole computer. The only information I can find is that yes, you can do it yourself, but only after emptying your bank account to buy the software from GM. Is this true or are there more, ahem, covert ways to go about this without having to pay GM because the car they built broke?

BTW, the engine runs absolutely flawlessly. I can't imagine it running better at it's age and mileage, it's just I'd really rather have the check engine light off so it can alert me to a real problem if one comes up.
Do you
have the same problem?
Sunday, January 12th, 2020 AT 3:17 PM

1 Reply

Good evening,

Let us start with the actual code numbers. Codes rarely identify failed parts, just failed systems. AutoZone is in the business of selling parts for there free code check. That is not a diagnostic at all. It is a code check.

I need the code to try to get to the root cause of the light coming on for you.

Was this
Sunday, January 12th, 2020 AT 4:34 PM

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