1997 BMW 740i 4.4L Surge, MIL Lamp on
Downstream and upstream o2 sensors seem to switch at the the same rate on both banks but only bank one code for cat efficiency returns. mil illumination coincides with a slight surge feeling,(reported by cust) Any help would be welcome.
FIX posted 9/26/2006
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Vehicle Data1997 BMW 740i
Trouble Codes
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Vehicle Data
1997 BMW 740i
VIN | WBAGF8327V |
Engine | 4.4 L / 8 cyl / GAS |
Trans | 5-speed Automatic (Electronic) |
Delivery | FI / SEFI |
Emissions | OBD-II Compliant |
Symptoms | Surge, MIL Lamp On |
Occurs | Always |
Misc. | Recent Catalyst |
Trouble Codes
P0420 | Catalyst Efficiency Below Threshold (Bank 1) |