Question about 2005 Dodge Ram 1500

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05' Dodge RAM 1500 code p0420. I've been changing oxygen sensors since u bought it 2 years ago, thought the problem was solved but yet again check engine light came on, could there be an other problem??

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  • Dodge Master
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P0420 indicates that there is a catalytic converter inefficiency. Although its not a bad idea to replace the downstream O2 to see if that is the problem, the true problem is usually the catalytic converter itself.

I'm pretty sure Chrysler has an 8 year 80,000 mile emissions warranty that would cover the catalytic converter. Sometimes they extend them to even longer intervals. If you close to that mileage it may not hurt give the dealer a call.

Posted on Apr 04, 2011

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  • Master
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Hello: Code P0 420 indicates the catalytic converter is operating below calibrated efficiency (below 60%) replacing the oxygen sensors will not correct the condition. The converter needs to be replaced and the code cleared.

Posted on Apr 04, 2011

  • shadi shahin
    shadi shahin Mar 09, 2014

    i got this error p0420 i change my o2 sensor the front and the rear one didnt fix it i use sea foam didnt fix, then i replace the part and it coast me 287$ the problem is gone, my advice to you replace the part before u start spending your money on diff parts have nothing to do with it

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I had a P0138 code after a diagnostics test on my 2006 dodge ram 1500 4X4, what does this mean?


P0138 DODGE - O2 sensor 1/2 Circuit highxicon.jpghttp://engine-codes.com/p0138_dodge.htmlForum CodePossible causes- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Rear Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks Tech notes Replacing the rear O2 Sensor bank 1 usually takes care of the problem.

Jul 09, 2012 | 2006 Dodge Ram 1500

1 Answer

2004 Dodge Ram P0420 code. What could be causing this? My emissions are clean (all were within limits), and I just replaced all 4 oxygen sensors


This code is set when the catalytic converters are operating below tolerable efficiency limits. Basically, your catalytic converters are bad and are in need of replacement. You can have bad converters and still pass emissions, but your computer uses the oxygen sensors to determine how well they are working. If the readings are out of a set tolerance, the check engine light will illuminate and DTC P0420 will set. Clearing the code will turn the light out temporarily, but the next time the test is run, the light will come on again.
Hope this helps.

Oct 20, 2010 | 2004 Dodge Ram 1500

2 Answers

My 2003 dodge ram 1500 shows dtc code P0420 can you tell me the problem


PO420 code tells you the catalytic converter is not reaching the proper temperature .. that is measured by the back oxygen sensor (just behind the CAT ... make sure the heat shield is in place (in cold weather) .. you can check for a rattle in the cold CAT (thats bad) .. the rear O2 sensor can be bad or you could have a bad catalytic converter or one thats on it way to being bad .. there are some tests a mechanic can do .. 1. a back pressure test 2. measure the temperature of the CAT surface .. it should be around 225 deg F (after warmup) .. a non contact (IR) thermometer is handy for this .. make sure the pipe behind the CAT and the muffler are not leaking ..some "high flow rate " replacement mufflers will cause the trouble ..

Jul 02, 2010 | 2004 Dodge Ram 1500

2 Answers

Code p0332 and p0420


16716/P0332 - Knock Sensor 2 (G66): Signal Too Low Possible Symptoms
  • Irregular rpm
  • Drivability problems
  • Loss of power
  • Engine damage
Possible Causes
  • Circuit G66 short to Ground
  • Circuit G66 open
  • G66 improperly torqued
  • G66 damaged
  • Control Module damaged
16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold Possible Causes
  • Leakage in Intake and/or Exhaust System
  • Catalyst faulty
  • Oxygen Sensor(s) faulty
  • Oxygen Sensor(s) Control faulty
Possible Solutions
  • Check Intake and Exhaust System for Leaks
  • Check Catalyst
  • Check Oxygen Sensor(s)
  • Check Oxygen Sensor(s) Control
    • Perform Oxygen Sensor(s) Aging Check

May 03, 2010 | 2000 Chevrolet Monte Carlo

2 Answers

Engine code p0420


The P0420 code is set when the oxygen sensor after the catalytic converter gives a reading the same or very close to the reading of the oxygen sensor(s) before the catalytic converter.

There are usually three possible causes...
The front oxygen sensor (before the cat) is giving an incorrect reading.
The rear oxygen sensor (after the cat) is giving an incorrect reading.
The catalytic converter is not working properly.

Since you recently replaced the cat, the logic points to the sensors, but it could be the cat again. Aftermarket converters are usually smaller than OEM and don't last as long.

For a more thorough description of the code and troubleshooting visit
http://www.obd-codes.com/p0420

Our Subaru encountered this issue several years ago under warranty. The first time the dealer replaced the front oxygen sensor. This was the cheapest repair and since it was an intermittent problem I am sure they hoped to delay the issue until the warranty was up. The second time they replaced the catalytic converter and we haven't had any more issues.

Jan 08, 2010 | 2000 Honda Civic

1 Answer

I asked the question..."I have a 2003 dodge ram 1500 4x4 with the 4.7L engine. The check eng light is on. obd2 reads code P 0038 And says HO2S Heater Control Circuit High (Bank 1, Sensor 2). the heater is...


P0038=HO2S Heater Control Circuit High Bank 1 Sensor 2,
The oxygen sensors on your truck have an extra wire to them,they are a heated oxygen sensor,
the computer sees a problem with the heated oxygen sensor on the drivers side,before converter.
not the sensor after converter!

Jan 08, 2010 | 2008 Dodge Ram Pickup 1500

1 Answer

1999 Dodge Ram 1500 Pickup error code p0171


This code means that system to lean, bank 1.
some of the possible causes to make this code set are
1. intake or exhaust leak,
2. problem with the air system.
3. MAF (Mass Air Flow sensor)VAF sensor (Volume air flow sensor)
4. fuel pressure/pump
5. injector(s)
6. HO2S (Oxygen sensor)

Sep 15, 2009 | 2003 Jaguar Vanden Plas

2 Answers

P0132 code along with P0300, P0301, P0302, etc.


check for intake manifold for vacuum leaks, use a can of spray carb cleaner and spray around the top of the engine, if you hit a leak the engine idle will change, P0302 is a miss in #2 cylinder (cylinder power output low, lean cylinder due to poss vacuum leak and other issues.). once again an O2 will not cuase a mis-fire.

Mar 17, 2009 | 1998 Dodge Ram 1500 4WD

2 Answers

Trouble shooting P0420 code, bank 1, OBD II for 2000'?


misfiring can cause a P0420 code.
I would recommend a set of honda plug wires and plugs if the P0420 code returns.
I have used bolt in aftermarket bolt in catalytic converters but don't remember the brand name they fit ok and i have had 1 or 2 return with a P0420 code out of about 20. I have never replaced the oxygen sensor on a civic like yours.
I always fix the misfire problems, reset the computer, and have the customer drive it and see if the code p0420 returns. 50% don't have the P420 code return. drive it and see what happens and go from there.

Jan 06, 2009 | 2000 Honda Civic

1 Answer

2004 Dodge Ram 1500 4.7l


Code p0113 is for the intake air temp sensor. It probably did not get plugged in during the egnine replacement. That will not cuase it not to idle. I need more information for that concern.

Aug 01, 2008 | 2004 Dodge Ram 1500

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