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The Water Cooler
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<blockquote data-quote="SPDguns" data-source="post: 3212150" data-attributes="member: 17621"><p>Go to Autozone, have them reset the code (it's free). When the check engine light comes back on, go back to Autozone and have them read it. P0420 is an emissions code which is either the O2 sensor(s) or the catalytic converter or both. The O2 sensor is 80-100$ and is a 5 minute fix. Your V6 engine has 4 O2 sensors, one before and one after the catalytic converter on each side depending on the motor. The code reader should tell you which "bank" (bank 1 is driver's side, bank 2 is passenger side) and which sensor (sensor 1 is before the cat, sensor 2 is after the cat). If it were me, I'd change the O2 sensor first because the cat(s) can run 400-1000$ I had a '08 LeSabre with the same engine and it ate O2 sensors at the rate of one every couple of years. I hope this info helps and if no other reason you can go into your mechanic educated.</p><p></p><p>YMMV. Glocks are better than 1911's.......</p></blockquote><p></p>
[QUOTE="SPDguns, post: 3212150, member: 17621"] Go to Autozone, have them reset the code (it's free). When the check engine light comes back on, go back to Autozone and have them read it. P0420 is an emissions code which is either the O2 sensor(s) or the catalytic converter or both. The O2 sensor is 80-100$ and is a 5 minute fix. Your V6 engine has 4 O2 sensors, one before and one after the catalytic converter on each side depending on the motor. The code reader should tell you which "bank" (bank 1 is driver's side, bank 2 is passenger side) and which sensor (sensor 1 is before the cat, sensor 2 is after the cat). If it were me, I'd change the O2 sensor first because the cat(s) can run 400-1000$ I had a '08 LeSabre with the same engine and it ate O2 sensors at the rate of one every couple of years. I hope this info helps and if no other reason you can go into your mechanic educated. YMMV. Glocks are better than 1911's....... [/QUOTE]
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