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2005 Toyota Camry LE 4dr Sedan Manual (SE)

2005 Toyota Camry
Trim Info:
Front Wheel Drive, 4 Door Sedan, Mid-Size
24 mpg city / 33 mpg hwy
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April 1, 2013, 1:29 pm

Deena S

Question: Does my ECM need to be reflashed again after replacing the catalytic converter?

I had my CC replaced in Jan 2012-ECM was reflashed at this time. CEL came on in Oct 2012-had my O2 sensor replaced at that time. CEL came on again in Dec 2012-was told CC needed to be replaced again because spark plug had problems. They replaced the CC for free since it was still covered under warranty. CEL came on again this month (March 2013). I went to a different mechanic and PO420 codes were pulled. I went back to the original place-they are saying that the CC is fine but the ECM needs to reflashed (apparently it wasn't done when they replaced second CC) which they are doing for free since it is still under warranty. I am starting to think that something sketchy is going on here-like they are just buying time til i am no longer under warranty. Does the issue with the ECM sound legit?

April 16, 2013, 10:21 am

Elizabeth K

This sounds suspicious. Catalytic converters fail for a reason, and it doesn't sound like the reason is clearly being addressed. The ECM should not need to be reflashed, and it sounds like you've got to find the problem the cats keep failing. It's possible that the first shop is in over their heads. I recommend you get a different shop to diagnose the problem (pulling codes is not a diagnosis, it's just a first step).

Below is a link of the possible causes of the p0420 code. If the shop has not tested all of the other components, then they are not doing the job properly.

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