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2005 Chrysler Pacifica Code P0420

Tiny
CAR4424
  • MEMBER
  • 2005 CHRYSLER PACIFICA
  • 3.5L
  • V6
  • AWD
  • AUTOMATIC
  • 100,000 MILES
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
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Tuesday, February 18th, 2014 AT 8:42 AM

11 Replies

Tiny
CAR4424
  • MEMBER
  • 36 POSTS
Sorry It was dark when I wrote it down. It's ECT 199 degrees F And STFT BI-3.1% LTFT BI 0.7%
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Tuesday, February 18th, 2014 AT 9:36 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
What is the code?
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Tuesday, February 18th, 2014 AT 9:37 AM
Tiny
CAR4424
  • MEMBER
  • 36 POSTS
P0420
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Tuesday, February 18th, 2014 AT 9:50 AM
Tiny
CAR4424
  • MEMBER
  • 36 POSTS
It's the same Question as above. I didn't know how to add to it so I posted an answer
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Tuesday, February 18th, 2014 AT 9:52 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
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.
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Tuesday, February 18th, 2014 AT 12:18 PM
Tiny
CAR4424
  • MEMBER
  • 36 POSTS
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
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Tuesday, February 18th, 2014 AT 1:01 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
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.
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Tuesday, February 18th, 2014 AT 1:03 PM
Tiny
CAR4424
  • MEMBER
  • 36 POSTS
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.
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Tuesday, February 18th, 2014 AT 2:07 PM
Tiny
CAR4424
  • MEMBER
  • 36 POSTS
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
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Wednesday, February 19th, 2014 AT 11:04 AM
Tiny
CAR4424
  • MEMBER
  • 36 POSTS
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.
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Thursday, February 20th, 2014 AT 6:48 AM
Tiny
CAR4424
  • MEMBER
  • 36 POSTS
130,000 just had to replace converter took 3 months to go bad
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Wednesday, June 4th, 2014 AT 10:30 AM

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