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Old 05-13-2012, 12:36 AM
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Default P0420

This came up on my 2002 QX4. I replaced the rear cat last summer, time to change the front one?
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Old 05-13-2012, 04:04 PM
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It could be the front cat, P0429 is a code for the 'warm up' catalyst, or it could be a lazy or bad O2 sensor.
If the sensor has more than 70K on it I'd change that first.
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Old 05-13-2012, 10:11 PM
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yeah, except those sensors are NOT cheap......
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Old 05-14-2012, 10:42 AM
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Depending on the miles on the car you probably need to change the sensor anyway.
If you hunt around you can find decent prices on O2 sensors.
I've picked up sensors from both rock auto and off eBay, it just depends on the sensor at the time.
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Old 05-17-2012, 02:57 AM
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$40 each for the part from Rock Auto. Gonna take it and see what the labor cost is.....
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Old 05-17-2012, 10:29 AM
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Quote:
Originally Posted by Sassan View Post
$40 each for the part from Rock Auto. Gonna take it and see what the labor cost is.....
The labor is how ever long it takes you grab a wrench and change the thing.
Changing a downstream O2 sensor is way easy since they're further down the exhaust and not right up against the engine.
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Old 05-31-2012, 11:41 AM
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the upstream sensors are BIOTCH to get to, probably 2-3 hrs labor each
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Old 05-31-2012, 11:44 AM
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Upstream sensors won't throw a P0420 code.
That is strictly a downstream sensor or precat error.
Upstream sensors measure fuel in the exhaust so they help the ECU regulate air/fuel mixture.
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Old 12-31-2012, 01:49 AM
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And it came back today........new cat on the truck, not sure what else other than an O2 sensors.
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Old 12-31-2012, 05:26 PM
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How many miles do the sensors have on them?
I had a nagging P0420 code on my old POS Mazda and a new, universal Bosch sensor made it go away.
A direct replacement didn't work but the universal Bosch did.
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