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P0156 Diagnostic Trouble Code Discussion for June 2012

Heated Oxygen Sensor (Bank 2 Sensor 2) Closed Loop Fuel Control

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Trouble Ticket Help Requests for DTC P0156
Help Request Posted
1997 Mercedes-Benz S420 4.2L MIL Lamp on VIN: WDBGA43G5V
P0156: b2s2 oxygen sensor fault. I need some help on a crazy oxygen sensor car. It has been to 2 dealers and here for rear oxygen sensor codes. oxygen sensors have been replaced by both dealers and by us, with bosch and oem parts, problem still returns. All wiring has been checked, for ground...
June 06, 2012