check it out and let me know. how does the car drive? * the easiest way to test for a bad conerter is to unplug ita t the manifold. you will need two new bolts since the old ones will snap off. take for a drive. Warning, it will be VERY loud. bring license and registration, as well as a good story. before heading out clear all codes by disconnecting negative terminal for 10 seconds. if at the end of the trip the codes are gone, then you have your answer.
All oxygen sensors are located in the exhaust system. Some have one in the manifold, some have one before the catalytic converter. Then others have one before and one after the converter. It requires a special socket to remove and replace it. Just because your code says oxygen sensor, does not mean it is bad. A vacuum leak can give a code that the sensor is reading lean.
The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the p0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). The code P0420 may mean that one or more of the following has happened: Leaded fuel was used where unleaded was called for, an oxygen sensor is not reading (functioning) properly, the engine coolant temperature sensor is not working properly, damaged or leaking exhaust manifold/catalytic converter/exhaust pipe, retarded spark timing, the oxygen sensors in front and behing the converter are reporting too similar of readings
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