P0420 Diagnostic Trouble Code Discussion for February 2004
Catalyst Efficiency Below Normal (Bank 1)
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| Help Request | Posted | |
| 1998 Dodge Neon High Line 2.0L catalyst effeciency VIN: 1P3ES47YXW P0420: Catalyst Efficiency Below Normal (Bank 1). this vehicle came in december 2002 with a rod bearing spun. we removed the engine and the customer took it to a machine shop to have it rebuilt. when we were reassembling the vehicle, we noticed that the inlet pipe to the catalytic converter was broken/cracked... |
February 18, 2004 | |
| 1998 Chevrolet K1500 Suburban LS 5.7L MIL Lamp on VIN: 3GNFK16R2W P0420: Catalyst System Low Efficiency (Bank 1). Need some insight to this problem. Scan readings of 02 b1s2 shows 70mv steady and 02 b2s2 about 720mv steady on fully warmed up system. Both waveforms have some slight activity as it should in respect to the front 02 waveforms. Cranking test of exhaust shows 9... |
February 19, 2004 | |
| 1999 Chevrolet Lumina 3.1L MIL Lamp on VIN: 2G1W152M1X P0420: Catalyst System Low Efficiency. ... check engine light. First time was catalyst code P0420. That is when the convertor and O2 sensors and tuneup was done. Vehicle left and was fine for awhile, brought back for light on again, this time it was a random misfire code. Checked misfire counters, ... |
February 26, 2004 |
