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Re: when is my 2004 rodeo due for a tune up
P0420 means Catalyst System Efficiency Below Threshold, Bank 1 It
means that your catalytic converter, in the exhaust system is not working
fine, as its emissions are polluting the air too much.
The catalytic converter is part of the exhaust system. The way to test this part is by doing an emission test. The two OBD
codes that you are getting are already a test telling you that the
converter must be replaced, unless an emission test done at a garage
says the opposite.
This kind of problem will trigger the check engine light, and your car will also waste too much fuel. You
also risk to get in trouble if the car goes through an Air Pollution
control, as the car won't pass an emission test in this condition.
To conclude, the Catalyst System must be replaced, the O2 Sensors are fine.
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Tune it up and replace the 02 sensor that keeps setting the codes bank 2 sensor 1. Have your oil and filter changed right before you go for a retest to. That will clear up 3 codes P0300, 0155 and 0154. You might have to replace the fuel sending unit to get rid of P0463 but if the gauge works OK I'd leave it alone.
Have the vehicle scanned for diagnostic trouble codes to see if any have set due to a malfunction.Either a scan tool,or a code reader can access your vehicle's computers.If there is a diagnostic trouble code present,places like All Data online have the diagnostic routes for each trouble code.The diagnostic route,performed properly,will lead to the conclusion of what is malfunctioning.