Chrysler Pacifica Luxury meets versatility in this mid-sized sport utility vehicle

P0420 / Catalytic Converter Workaround

  #1  
Old 10-12-2018, 06:08 PM
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Default P0420 / Catalytic Converter Workaround

Have been thru three cat converters on my '05 Pac. The engine light comes on every 2 years and throws the dreaded P0420 code when the cat falls below 96% efficiency.

In my state it is allowable for a vehicle to pass emissions inspection with 1 monitor not complete. For the past three years I have used a simple I/M scanner, AutoLink #AL319, to reset the monitors and engine light. Then after about 55 miles of casually driving around town all the monitors will check in with a passing grade, leaving the Cat monitor as the sole monitor not complete. Duck into the nearest inspection station without shutting off the engine and she passes with 1 monitor not set.

All is good once again. Maybe I will bit the bullet and put another new Cat on it next year...
 

Last edited by djetelina; 10-23-2018 at 11:47 AM.
  #2  
Old 10-13-2018, 05:01 AM
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Another work around that can be done is using a spark plug anti fouler to fool the post cat sensor. Pull the post cat sensor, get 2 spark plug anti fouler s that fit the thread, drill one out so the tip of the sensor fits thru. Reinstall sensor using both anti fouler s and you will not see the code again. Has worked for me and many others
 
  #3  
Old 10-13-2018, 09:52 AM
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Originally Posted by FIREM View Post
Another work around that can be done is using a spark plug anti fouler to fool the post cat sensor. Pull the post cat sensor, get 2 spark plug anti fouler s that fit the thread, drill one out so the tip of the sensor fits thru. Reinstall sensor using both anti fouler s and you will not see the code again. Has worked for me and many others
I agree, But I must live a charmed life in Western NY(tough emissions check) My last 2 03 & 04 3.8 T&C's my current 04 T&C , my 98 Avenger 2.5 all have had at least 110k miles(the vans close to 200K miles) and only my old 04 T&C gave P0420 codes...UNTIL I fixed (replaced) the NVLD(an EVAP part) sensor. NEVER had a CAT go bad on any of my many MOPAR rides!
 
  #4  
Old 10-30-2018, 03:46 PM
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Originally Posted by FIREM View Post
Another work around that can be done is using a spark plug anti fouler to fool the post cat sensor. Pull the post cat sensor, get 2 spark plug anti fouler s that fit the thread, drill one out so the tip of the sensor fits thru. Reinstall sensor using both anti fouler s and you will not see the code again. Has worked for me and many others
Many thanks FIREM! That is like the best/easiest trick I have done this year. Bought a pack of two (2) 18mm Spark Plug anti foulers @ Oreilly for 4 bucks. Drilled one of em out w/ 1/2" bit. Unscrewed the O2 sensor that fits midways on the Cat, inserted said pair piggy backed anti foulers, drove Pac around a bit to burn off excess hydrocarbons from the drilling operation, reset the monitors and all came back cherry! P0420 code is gone..
 

Last edited by djetelina; 10-30-2018 at 04:06 PM.
  #5  
Old 10-30-2018, 04:38 PM
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Good to here it worked yet again. While I have not yet personally had a Mopar fail a converter it did work on a GM we had.
 
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