2001 chysler PT Cruiser

Tiny
EUGENE SANCHEZ
  • MEMBER
  • 2001 CHRYSLER PT CRUISER
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 102,000 MILES
Trouble code P0420 "catalyst system efficiency below threshold", Ican guess but rather know exactly the meaning can you help?
Wednesday, January 19th, 2011 AT 3:17 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,913 POSTS
Basically that is saying the catalytic converter isn't working. However, that same code can be set by a bad O2 sensor. Check to make sure the sensor (using a live data scanner) is staying witin.25v and.35v. If it is outside that, the sensor is bad.
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Monday, February 14th, 2011 AT 3:34 PM

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