had a scsn said o2 sensor sensor 1 bank 1,replaced sensor about 2 wks ago,lite went off 2 days came back on. scan also said heater circuit malfuntion.
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1997 Toyota Avalon Question: check eng lite
Answer #1blindsquirrel July 31, 2009, 16:35Journeyman
Check for vacuum leaks for starters. Exactly which sensor did you replace? Was it the front or the rear? Does the code give you any more information?
Answer #2patrick mannion from Greg Solow's Engine Room, July 31, 2009, 19:15Master
Bank one on that engine is the rear bank of cylinders ensure the correct sensor was replaced. Heater circuit failure is common on these cars.