P0420 Diagnostic Trouble Code Discussion for March 2004
Catalyst Efficiency Below Normal (Bank 1)
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| Help Request | Posted | |
| 1999 Honda Accord EX 2.3L MIL Lamp on, P1457 P0420: Catalyst Efficiency Below Threshold (Bank 1). ... for goodwill repair on this just-out-of-warranty Accord (she's had problems with their 'service' in the past) after we quoted replacement of Cat and 2 solenoid valves for customer. We replaced the Cat, CSV and EVAP bypass solenoid, cleared codes and attem... |
March 09, 2004 | |
| 1999 Mercury Cougar 2.5L Poor Idle Quality, Hesitation, Surge, Poor Fuel Economy, MIL Lamp on VIN: 1ZVHX61L4X P0420: catalyst thresthold below efficiency. Have this cougar, ck engine light on for code po420 (catalyst threthold below efficiency), also have pending code for po402 for egr flow. Inspected exhaust system for damage okay, car runs good no missfire, does have a little rough idle and under hard accelera... |
March 15, 2004 | |
| 1997 Mercury Mystique 2.5L No Start, Stall, MIL Lamp on VIN: 1MELM66LOV P0420: catalyst efficiancy. ... cruise speed. would restart and die. after several attempts had it towed, started and ran ok when arrived at repair facility. drove car back home without further trouble. while driving home check engine light came on (code p0420). while car at our facility... |
March 17, 2004 |
