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What causes the check engine light to come on on my Dodge Grand Caravan?

Tiny
PAPET
  • MEMBER
  • 2000 DODGE CARAVAN
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 325,000 MILES
I have changed the cat converter, oxygen sensor and the EGR valve already and has been reset. But after a couple of days, the check engine light is back. What must be the real problem on my vehicle?
Wednesday, September 28th, 2011 AT 11:39 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,170 POSTS
I need to know what trouble code shows up when the computer is scanned. Do you know?
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Wednesday, September 28th, 2011 AT 12:21 PM
Tiny
PAPET
  • MEMBER
  • 102 POSTS
The code is P0420. Thanks.
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Wednesday, September 28th, 2011 AT 12:36 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,170 POSTS
That is for the catalytic converter. Considering you have already replaced the converter and O2 sensor, there is most likely a wiring issue. Have you checked wiring to the sensor for damage, corrosion? Has you check (with a live scanner) the parameters of the sensor? Is it within spec?
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Wednesday, September 28th, 2011 AT 12:42 PM
Tiny
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  • MEMBER
  • 102 POSTS
Do you mean the oxygen sensor wirings? Thanks once again.
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Wednesday, September 28th, 2011 AT 2:13 PM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Yes, O2 sensor wiring.
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Friday, September 30th, 2011 AT 2:49 AM

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