Question:
I have a 2000 toyota Celica with 85000 miles and the check engine light has been on for a long time. I KNOW that it has to to with emmitions and my mechanic said that my cat convetor might be shot. one way to check is to bang on it and listen for rattles.. well it desn't rattle and I have banged on it, so I THINK it's the oxygen sensors. there are two of them and I don't know what is the culprit. parts for that car can be very expensive and hard to find, so I would like to be sure. so what do you think? one both or all three? I also have a cold air intake and I was wondering if that might account for the air fuel ratio being off and setting that light on.
Answers:
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The o2 sensor is that is being triggered is downstream of the cat. The o2 sensor measures temperature variances. The idea is that a cat will regulate the temperature of the exhaust gas pulses. If the sensor measures great temperature differences between the pulses it will trigger the p0420 code. Anyone who has installed a catless exhaust in cars with obd-II are familiar with this code. The o2 sensor only takes measurments at highway speeds so reset your ecu and see if highway driving sets it off. Many tuners "trick" the sensor by removing the sensor from the direct flow of the exhaust pulses so that less variation in temperature is detected, this technique employes 2 18mm spark plug anti foulers (search nasioc.com for part #'s and instructions).99 BMW 223I brake pad indicator?
Pay the money and have the toyota shop scan the code. Then you will know exactly what needs to be done. Can be very expensive to 'throw parts at the car'. Quit wasting time and money and do it right the first time.Where is the location of the EGR valve on a 1998 Ford Explorer 4.0?
I don't know why you don't trust us but P0420 is most likely a cat and they can still burn out and not rattle , if O2 was a problem it would have a O2 code with the P0420 you said its been on for a long time , two bad you don't like your dealer because cats are in warranty for 8years 80,000.More Questions & Answers ...
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