2000 Dodge Caravan 2000 Dodge Grand Caravan SE with a code

Tiny
MANOK
  • MEMBER
  • 2000 DODGE CARAVAN
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 276,000 MILES
Dear bob and ken, looking forward that you can help me with my problem with regards to my Caravan having a code of P0420. Which one shall I change? Is it the 2 oxygen sensors? Thanks a lot.
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Monday, August 25th, 2008 AT 8:59 PM

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Tiny
BMRFIXIT
  • EXPERT
SELF-DIAGNOSTICS - FWD VANS -2000 Dodge Grand Caravan SE

NOTE: Catalytic converter efficiency is monitored after engine is at 147 F (64 C), throttle has been open for 180 seconds, vehicle speed is more 20 MPH with engine at 1200-1700 RPM and Manifold Absolute Pressure (MAP) sensor vacuum is 15-20 in. Hg. DTC may be stored in Powertrain Control Module (PCM) if catalytic converter efficiency deteriorates and switching rate of downstream oxygen sensor become nearly the same as upstream oxygen sensor. If at any point during the test, if the switch rate reaches a predetermined value, a counter is incremented by one. Possible causes are: engine mechanical problem, exhaust leak, defective catalytic converter or upstream oxygen sensor is older than downstream oxygen sensor.
DTC P0420: 1/1 CATALYTIC CONVERTER EFFICIENCY
1. Turn ignition on with engine off. Using scan tool, check for DTCs. If GLOBAL GOOD TRIP counter is not displayed and equal to zero, go to next step. If GLOBAL GOOD TRIP counter is displayed and equal to zero, go to step 3. 2. At this time, conditions for catalytic converter efficiency failure does not exist or is an intermittent problem. Using scan tool, read FREEZE FRAME data while attempting to duplicate the condition that caused DTC to be set by paying special attention to the conditions that catalytic converter efficiency failure is monitored. Catalytic converter efficiency is monitored after engine is at 147 F (64 C), throttle has been open for 180 seconds, vehicle speed is more than 20 MPH with engine at 1200-1700 RPM and MAP sensor vacuum is 15-20 in. Hg. If DTC P0420: CATALYST 1/1 EFFICIENCY FAILURE reoccurs, go to next step. If DTC P0420: CATALYST 1/1 EFFICIENCY FAILURE does not reoccur, condition no longer exists. Perform TEST VER-5A3. 3. Start engine and allow engine to idle. Check for exhaust leaks between engine and downstream oxygen sensor. On 2.4L, downstream oxygen sensor is mounted near rear of catalytic converter. On 3.0L, 3.3L and 3.8L, downstream oxygen sensor is mounted on exhaust pipe, behind catalytic converter. On all models, downstream oxygen sensor may also be referred to as 1/2 O2 sensor. If no exhaust leaks exist, go to next step. If exhaust leaks exist, repair as necessary. Perform TEST VER-5A3. 4. Check exhaust for excessive smoke caused by coolant entering combustion chambers or high oil consumption. If excessive smoke caused by coolant entering combustion chambers or high oil consumption does not exist, go to next step. If excessive smoke caused by coolant entering combustion chambers or high oil consumption exists, repair engine as necessary and replace catalytic converter. Perform TEST VER-5A3. 5. Determine if downstream oxygen sensor has been replaced without replacing upstream oxygen sensor, as a newly installed downstream oxygen sensor with an existing aging upstream oxygen sensor may cause DTC to be set. If downstream oxygen sensor has been replaced without replacing upstream oxygen sensor, replace upstream oxygen sensor. Perform TEST VER-5A3. If downstream oxygen sensor has not been replaced without replacing upstream oxygen sensor, replace catalytic converter. Perform TEST VER-5A3.
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Tuesday, August 26th, 2008 AT 9:57 AM

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