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2002 Mitsubishi Eclipse

Tiny
CHARLES_ROSE
  • MEMBER
  • 2002 MITSUBISHI ECLIPSE
2002 Mitsubishi Eclipse 4 cyl Two Wheel Drive Automatic

My 2002 eclips service engin light is on
the test results said
Po421 Warm up catalyst bellow threshold (bank 1 )
but nobody can tell me what that means, can anyone help.
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Monday, July 28th, 2008 AT 2:54 PM

3 Replies

Tiny
KLSHIEL
  • MECHANIC
  • 163 POSTS
Your exhaust system is broke up into bank 1 and bank 2 On a rear wheel drive this is usually driverside, passengerside. Front wheel drive is more confusing. I believe this code is saying that your heated O2 sensor is not heating up fast enough. I would try to find a manual on your car to get more information.
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Monday, July 28th, 2008 AT 3:26 PM
Tiny
CHARLES_ROSE
  • MEMBER
  • 2 POSTS
So if I replace the o2 sensor that would be a smart first step?
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Monday, July 28th, 2008 AT 3:47 PM
Tiny
KLSHIEL
  • MECHANIC
  • 163 POSTS
I would start by checking the electrical to the sensor. You will need to dig up the specs for that. Then change the sensor if this is ok.
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Wednesday, July 30th, 2008 AT 9:09 AM

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