P0420 Diagnostic Trouble Code Discussion for December 2015
Catalyst Efficiency Below Normal (Bank 1)
Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.Trouble Ticket Help Requests for DTC P0420
| Help Request | Posted | |
| 2006 Ford F-350 Super Duty XL 5.4L Misfire VIN: 1FDSF30546 P0420: Weak Catalytic converter. This truck misses and bucks on acceleration. We have cleared codes and replaced #6 plug and coil. MIL flashes and mode six shows #6 misfires but no code. When watching fuel pressure on the scanned it is mostly at 40 psi but manual gauge only shows 30psi. We ca... |
December 04, 2015 | |
| 1997 Pontiac Firebird Formula 5.7L No Start, MIL Lamp on VIN: 2G2FV22P2V P0420: Catalyst System Low Efficiency (Bank 1). Hi and thanks for reading. This car was towed in no crank & no start. Battery was dead from cranking. After charging it cranks OK albeit seems to crank fast. This would indicate to me internal wear / timing chain? Has weak and intermittent spark. Has noid ... |
December 08, 2015 | |
| 2003 Acura MDX Touring 3.5L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire VIN: 2HNYD18693 P0420: Catalyst Efficiency Below Threshold (Bank 1). ... crazy because I can't pin point the problem. The problem is that after a while of driving it. NOT ALWAYS ACTS, ONCE A DAY OR EVERY OTHER DAY. when it starts acting up and it doesn't want to go and if I keep pressing the gas pedal it cut out, feels like it ... |
December 29, 2015 |
