2005 Chrysler Pacifica Code P0420

2005 CHRYSLER PACIFICA
100,000 MILES • 3.5L • V6 • AWD • AUTOMATIC
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CAR4424
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Engine light went on. Engine not missing. Uses one quart of oil every 2,500 miles. Reader showed Load 48.6%,BTC 199 degrees F, Shift BI -3.1%, Lift BI 0.7%, MAP 19.1, RPM 1994, Speed 55, Spark adv. 47 degrees, IAT 26 degrees F and TPS 26.2%. I was hoping it would be O2 sensors since they get lazy at 100 thousand miles and the car runs fine. I"m hoping i'ts not a converter since they are around 200 dollars
Feb 18, 2014 at 8:42 AM
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CAR4424
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Sorry It was dark when I wrote it down. It's ECT 199 degrees F And STFT BI-3.1% LTFT BI 0.7%
Feb 18, 2014 at 9:36 AM
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HMAC300
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what is the code?
Feb 18, 2014 at 9:37 AM
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CAR4424
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P0420
Feb 18, 2014 at 9:50 AM
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CAR4424
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It's the same Question as above. I didn't know how to add to it so I posted an answer
Feb 18, 2014 at 9:52 AM
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HMAC300
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420 is a converter code but it can also be an air leak in the exhaust system prior or behind it. It also can be a an O2 sensor not working right but normally is a converter problem also do this -what are the o2 sensors doing. add fuel and see if they go full rich, pull a vacuum line and see if they go full lean. all four o2 sensors should react to rich/lean test. if not then maybe you have a faulty o2 causing bad readings. also check for vacuum leaks with a smoke tester engine cold. also check the egr pipes if they are cracked it will leak air and give you this code.
Feb 18, 2014 at 12:18 PM
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CAR4424
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I picked up 2 Denso O2 sensors This car only has 2. I will put them in tomorrow The short term fuel Was a Minus 3.1 percent and the long term fuel was .7 percent. I will post tomorrow or if light doesn't come back on after I reset
Feb 18, 2014 at 1:01 PM
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HMAC300
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I told you how to check this and what to look for I don't know why you think it's the O2 sensors it may not be.
Feb 18, 2014 at 1:03 PM
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CAR4424
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Your right but o2 sensors don't last forever and for 30+ dollars they need to be replaced anyway. I will check everything you mentioned tomorrow when I have the car to work on. Thanks for your help.
Feb 18, 2014 at 2:07 PM
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CAR4424
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I just replaced the o2 sensors took about 1/2 hour and connected the battery. Checked over all the hoses and started engine and found no exhaust leaks. Ran engine for 1/2 hour at idle and then took for a 10 mile drive and it ran fine. Pulled back on ramps and used infrared thermometer and had 450 on inlet and 550 on outlet. No check engine light yet. I don't have a meter that reads real time only freeze frame so I can' read the o2 sensors unless I back probe. In the future I'll upgrade to a meter that will read real time. Innova has a upgrade policy for 99 dollars to upgrade but i'm not sure they will give me a different meter that reads real time. Mine is only a 3150. I will try it for a week and see if light comes on otherwise I will figure it fixed. Thanks again
Feb 19, 2014 at 11:04 AM
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CAR4424
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I did a drive cycle today for an hour and a half and all monitors came on and there are no pending codes so I will consider it fixed.
Feb 20, 2014 at 6:48 AM
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CAR4424
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130,000 just had to replace converter took 3 months to go bad
Jun 4, 2014 at 10:30 AM