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I recently had an engine fault code of p0420 and I have already

replaced the bad O2 sensor...
I recently had an engine fault code of p0420 and I have already replaced the bad O2 sensor. After driving 60+ miles the engine light came on with a different code p0135. I then hooked up an OBDII scanner and looked at the live data and the O2 sensors are working great, but I still get that code p0135. I also noticed that there is a TSB from chrysler about this TSB #05005. So could everything be running good with my pacifica and just have this false light? Also, how do I go about fixing this problem? If it is a TSB will the dealer fix for free?
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Answered in 1 minute by:
8/30/2009
CDJMasterTech
CDJMasterTech, Chrysler MasterTech
Category: Chrysler
Satisfied Customers: 1,608
Experience: Factory trained and certified Chrysler Master Technician, ASE Master Technician
Verified
I need your VIN number and mileage to check TSB applicability and possible warranty coverage.
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Customer reply replied 8 years ago
VIN#2C4GF48475R487769 , mileage 77,358
Your first problem is that code P0420 is a catalyst efficiency code for bank one that is almost always caused by a bad catalytic converter, while an oxygen sensor failure on the upstream or downstream side of bank one catalytic converter could in theory cause this code it is almost impossible. You cleared out the P0420 code and replaced one of the oxygen sensors, (You didn't say which one, your vehicle has four, but I suspect you replaced the upstream sensor on bank one), the sensor you installed is bad, likely from an auto parts store, and this is setting the code PO135 and preventing the computer from running a catalyst efficiency test which would again set the P0420 code. You need to replace the bank one catalytic converter and the bank one upstream oxygen sensor, make sure you use a dealer part for the oxygen sensor. If I have answered your question please hit accept.
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Customer reply replied 8 years ago
What can I expect to pay if I bring it to a dealership to fix the problem. Also, can I continue to drive the vehicle without causing further damage?
Your first problem is that code P0420 is a catalyst efficiency code for bank one that is almost always caused by a bad catalytic converter, while an oxygen sensor failure on the upstream or downstream side of bank one catalytic converter could in theory cause this code it is almost impossible. You cleared out the P0420 code and replaced one of the oxygen sensors, (You didn't say which one, your vehicle has four, but I suspect you replaced the upstream sensor on bank one), the sensor you installed is bad, likely from an auto parts store, and this is setting the code PO135 and preventing the computer from running a catalyst efficiency test which would again set the P0420 code. You need to replace the bank one catalytic converter and the bank one upstream oxygen sensor, make sure you use a dealer part for the oxygen sensor. Also I checked, there are no TSB's for your Pacifica that have anything to do with oxygen sensor or catalytic converter codes. You do however still have federal emissions coverage until 80,000 miles and this should cover the catalytic converter and oxygen sensor if you take it to a dealer, but you are going to have to reinstall the original sensor. Factory warranty is not going to cover an aftermarket part. If I have answered your question please hit accept.
CDJMasterTech
CDJMasterTech, Chrysler MasterTech
Category: Chrysler
Satisfied Customers: 1,608
Experience: Factory trained and certified Chrysler Master Technician, ASE Master Technician
Verified
CDJMasterTech and 87 other Chrysler Specialists are ready to help you
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Sorry, for some reason half my post got removed, I have reposted again, with all the information. If I have answered your question please hit accept.
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CDJMasterTech
CDJMasterTech
CDJMasterTech, Chrysler MasterTech
Category: Chrysler
Satisfied Customers: 1,608
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