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2001 Pontiac Grand Prix GT 3.8L Monitor reset
Posted to GM Driveability on 7/7/2008 12 Replies

Car came in for NYS inspection. Code 420 set

Graphing the downstream O2 revealed it was switching lean to rich equal to upstream O2. Replaced O2 and sensor graphed correctly.

Cleared code and attempted 1st monitor reset. O2 O2 heater and EGR reset with no p...

12 Replies Received (View Replies)

  Related Documents & Media  2001 Pontiac Grand Prix GT

 
Message Closed w/FIX

car Vehicle Data

2001 Pontiac Grand Prix GT

VIN 1G2WP52K51
Engine3.8 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / SFI
EmissionsOBD-II Compliant
SymptomsMonitor Reset
Misc.3.8 Liter No Air Pump

Trouble Codes

P0420Catalyst Efficiency Below Threshold (Bank 1)
Message Closed w/FIX

car Vehicle Data

2001 Pontiac Grand Prix GT

VIN 1G2WP52K51
Engine3.8 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / SFI
EmissionsOBD-II Compliant
SymptomsMonitor Reset
Misc.3.8 Liter No Air Pump

Trouble Codes

P0420Catalyst Efficiency Below Threshold (Bank 1)