1999 Honda CRV code P0420

Tiny
JOEY LITTLE
  • MEMBER
  • 1999 HONDA CRV
  • 4 CYL
  • AWD
  • AUTOMATIC
  • 150,000 MILES
I have a code p0420 that says catalyst efficiency below threshold(bank 1). What is this?
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Sunday, February 15th, 2009 AT 9:40 AM

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Tiny
BLUELIGHTNIN6
  • EXPERT
Usually a faulty O2 sensor will throw this code. Need to check your oxygen sensors. Follow the link below to learn how to test an oxygen sensor.

http://www.2carpros.com/how_to/how_to_test_oxygen_sensor.htm

If sensors are OK, need to flow test the catalytic converter..

Thanks for using 2CarPros.com!
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Sunday, February 15th, 2009 AT 11:01 AM

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