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Help! Voltage Problem? (P0428)

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Old Feb 6, 2009 | 10:51 AM
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Question Help! Voltage Problem? (P0428)

So my check engine light came on yesterday and after I took the car to autozone for a check engine light diagnosis, the following came up:


OEM Number to Cross: P0428

The PCM has determined that the voltage signal from the catalyst temperature sensor for bank 1 is too high for the current engine operating conditions. (bank 1 identifies the location of cylinder 1, while bank 2 identifies the cylinders on the opposite bank)

Since I am kind of technologically challeneged, I was wondering if anyone could translate that into plain english for me? I am guessing my engine is running hot? But the temp sensor seems normal.... Any help will be sincerely appreciated!

Thanks!
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Old Feb 6, 2009 | 11:17 AM
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From: Spokane Valley, Washington
Sounds like a cat or sensor issue.
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Old Feb 6, 2009 | 11:28 AM
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Cat might be clogged.
What year is your car? Mileage?

Cat is covered under emissions for 8 years, 80,000 miles.
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Old Feb 6, 2009 | 01:23 PM
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Car Spec

It's a 2004 RX8 with 30,000 miles. My warranty is no longer in effect, but it's nice to hear about the 8 year CAT warranty . Has anyone ever come across this problem before?
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Old Feb 6, 2009 | 01:27 PM
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Likely a sensor problem with the rear O2 sensor?
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Old Feb 6, 2009 | 01:29 PM
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yeah, maybe it's gunked up or something knocked it loose?
crawl under there and take a look.

Any other codes come up or just the 0428?
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Old Feb 7, 2009 | 01:20 PM
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No more codes, jus that one. Come to think of it I think I did scrape the cars bottom while backing out recently...I will check it out! Umm what exactly am I looking for btw, any specific location for the O2 sensor?
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Old Feb 7, 2009 | 01:36 PM
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Likely the narrow band sensor on the midpipe.....

It actually sticks down and is easily hit...god only knows why they put it there
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