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P0139 Diagnostic Trouble Code Discussion for December 2009

Heated Oxygen Sensor (Bank 1 Sensor 2) Slow Response

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Trouble Ticket Help Requests for DTC P0139
Help Request Posted
2001 Volkswagen Beetle GL 2.0L Poor Idle Quality, Surge, Stall, Poor Fuel Economy VIN: 3VWCB21C61
P0139: o2 sensor circuit slow response b1 s1. Came in with multiple codes, changed coolant temp sensor and drove fine for few trips (small trips) then started running rough, idle hunting customer also said they noticed it seems to use more fuel. Drove a few times to get check engine light and now have the...
December 07, 2009