1999 HONDA CRV CODE P0420

  • Tiny
  • joey little
  • 1999 Honda CRV

Engine Performance problem
1999 Honda CRV 4 cyl All Wheel Drive Automatic 150000 miles

i have a code p0420 that says catalyst efficiency below threshold(bank 1). What is this?

Do you
have the same problem?
Yes
No
Sunday, February 15th, 2009 AT 9:40 AM

1 Reply

  • Tiny
  • bluelightnin6
  • Expert
  • 17,061 posts

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!

Was this
answer
helpful?
Yes
No
Sunday, February 15th, 2009 AT 11:01 AM

Please login or register to post a reply.

Similar Questions