Replaced sensors; still get codes

Asked by Oct 22, 2019 at 10:28 PM about the 2006 Toyota Camry LE

Question type: Maintenance & Repair

I may not have enough details for anyone to offer help here, but I have to try.

I have a 2006 Camry LE (4 cyl.) which got a new (factory) catalytic converter
in early September, the one mounted on the front of the engine (the car has
94,000 miles). I replaced it because it had an after-market on it when I
bought it that had no shields. I decided to ante up and get a new cat so it
could be properly covered. In about a month the check engine light came on.
My mechanic said it was an 02 sensor. He changed the downstream one that
has connections running up into the car under the seat. The light came back
on. He changed the other downstream sensor. The light came back on.
Getting a 0 volts reading on the last sensor he put in, he put another one in.
The light came back on. Because I was away for a week, further work was
delayed until today. The diagnostic today wasn't conclusive; I think he said
the codes were 136 and pending 137. He thought it looked like the air/fuel
sensor was the culprit. So that was changed. The light came back on tonight.

He said this morning before that sensor was replaced that it could be the
computer. Has anyone had this kind of thing happen who might think it's the
computer? What else could it be? I know there are other variables (bad
connections and contamination, for example), but he checked what could be
seen. Is it time to take it to a Toyota dealer?

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