2002 Mitsubishi Eclipse

2002 MITSUBISHI ECLIPSE
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CHARLES_ROSE
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  • 2 POSTS
2002 Mitsubishi Eclipse 4 cyl Two Wheel Drive Automatic
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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.
Jul 28, 2008 at 2:54 PM
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KLSHIEL
  • ✓ASE Certified Mechanic
  • 163 POSTS
  • ASE Certified Mechanic
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.
Jul 28, 2008 at 3:26 PM
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CHARLES_ROSE
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so if i replace the o2 sensor that would be a smart first step??
Jul 28, 2008 at 3:47 PM
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KLSHIEL
  • ✓ASE Certified Mechanic
  • 163 POSTS
  • ASE Certified Mechanic
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.
Jul 30, 2008 at 9:09 AM
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