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Posted on Sep 07, 2011
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I have a P0420 & P0480 on a 2001 Monte Carlo - Monte Carlo Chevrolet Cars & Trucks

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  • Master 1,623 Answers
  • Posted on Sep 07, 2011
Anonymous
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PO420 is catalyst system efficiency below threshold--bank 1

PO480 is cooling fan 1 control circuit malfunction

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Bad catalytic converter on 2000 Monte Carlo SS

My son put his tester on it, gave him the code ??????? What code ? P0430 -P0420
P0430 Catalyst System Efficiency Below Threshold (Bank 2)

P0420 - Catalyst System Efficiency Below Threshold Bank 1

Sorry but you don't have a chance of doing this . special tools ,cost you you as much as to take to a shop . buying cheap cat's won't work either .
4helpful
2answers

Code p0332 and p0420

16716/P0332 - Knock Sensor 2 (G66): Signal Too Low Possible Symptoms
  • Irregular rpm
  • Drivability problems
  • Loss of power
  • Engine damage
Possible Causes
  • Circuit G66 short to Ground
  • Circuit G66 open
  • G66 improperly torqued
  • G66 damaged
  • Control Module damaged
16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold Possible Causes
  • Leakage in Intake and/or Exhaust System
  • Catalyst faulty
  • Oxygen Sensor(s) faulty
  • Oxygen Sensor(s) Control faulty
Possible Solutions
  • Check Intake and Exhaust System for Leaks
  • Check Catalyst
  • Check Oxygen Sensor(s)
  • Check Oxygen Sensor(s) Control
    • Perform Oxygen Sensor(s) Aging Check

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2003 monte carlo - both headlamps went out at the same time - replaced both bulbs - no effect - any ideas?

check your fuse box for a blown fuse. Your owners manual will have the fuse layout inside it.
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98 Monte carlo Z/34 cranks immediately then cuts

start by check ignition module(controls spark) do fuel pressure check to see if pressure within specs
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04 Monte Carlo 3.4L won't pass emissions changed gas cap still no luck. Diagnostics that fail are 1.) catalyst 2.) evaporative system 3.)o2 sensor Thanks, Joe

If the code you have is p0420, then it sounds like you mayu have a bad catalytic converter. This will inturn cause the oqygen sensor codes, It may still be under warranty. The warranty is up to 125k miles.
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