P0420 Diagnostic Trouble Code Discussion for June 2016
Catalyst Efficiency Below Normal (Bank 1)
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| Help Request | Posted | |
| 2005 Infiniti FX35 3.5L Misfire VIN: JNRAS08W35 P0420: Catalyst Efficiency Below Normal (Bank 1). ... First time customer. Customer wanted tune up and minor maintenance. Found oil in tubes of valve cover and replaced valve cover as only supplied by Inf. Vehicle ran good when done, but after road-test had misfire in # 5 cyl. Replaced coil and released vehic... |
June 06, 2016 | |
| 2002 Subaru Legacy L 2.5L MIL Lamp on VIN: 4S3BE63592 P0420: Catalyst Efficiency Below Normal (Bank 1). Still throwing a catalyst code after repairs. Noted yesterday while driving that the fuel trim is normal at idle, but runs at about -16 or -18 at 3500 rpm. Car runs and drives very well. Monitored air fuel ratio sensor and 02 sensor with scope, but not sure wh... |
June 14, 2016 | |
| 2002 Honda Civic LX 1.7L No Start, Poor Idle Quality, Stall VIN: 2HGES155X2 P0420: Catalyst Efficiency Below Threshold (Bank 1). ... throwing a temporary code p0420. these codes only showed up after a test drive for 15 to 20 minutes with the AC on. When the codes come the car has a severe loss of power and will not hardly go above 15 mph and very rough low i... |
June 16, 2016 |
