P0420/P0430 codes after changing the downstream O2 sensor - Toyota RAV4 Forums
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#1 (permalink) Old 05-12-2012, 10:36 AM
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P0420/P0430 codes after changing the downstream O2 sensor

My check engine light was on for the downstream 02 sensor so it was changed. I was good for about 150 miles until the check engine light came on with the codes P0420 and P0430. I've read posts online with people having similar problems and not having much luck even after changing the downstream O2 sensor and the catalytic converter. Any suggestions?

Also, I have had no change in my MPG or any other noticeable engine problems.
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#2 (permalink) Old 05-12-2012, 02:43 PM
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Clear the code and drive. Has worked for me for 6 years.
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#3 (permalink) Old 06-14-2012, 05:38 AM
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Same here! I've had my 2003 5dr GX since 2005 and sometimes the light will come on randomly - Seems to happen when I go from my regular daily short "slow" drives to a longer faster journey. From what I have found over the years that the tolerances are too close on the monitoring and it just throws the error code.
Clear it with an OBD2 reader and carry on - The MPG doesn't change at all and runs normally.
In the past have tried cleaning MAF Sensor but that didn't solve. Definitely wouldn't spend out on a new CAT as the emmissions at MOT time are nearly the same as when new.
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#4 (permalink) Old 06-14-2012, 01:05 PM
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I am beginning to question the wisdom of replacing my sensor since there has been no change in gas mileage, the upstream really only fine tune to lower emissions. Sensors are big bucks, I could buy a lot of gas for $150.
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#5 (permalink) Old 06-14-2012, 04:48 PM
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I have the excellent elm 327 blue tooth OBD II reader and an android phone running the app torque. I had a CEL come on for this sensor once and ran through another drive cycle and the light cleared it self. I thencleared the stored code with my OBD tool. I have never had it come back on or even store a code since. Also my OBD lets me look at the voltage coming from the sensor and it seems normal. If the codes come back after they are cleared some diagnostics would be a good idea.

On the road in my Rav4 since February, Traveling, Volunteering, Camping and also enjoying beer bikes and bacon. Check out the blog www.servicedriven.org
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