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Oxygen sensor heater 200 1989

posted by  Grey245 on  Sat Feb 26 10:58 CST 2022
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"Over the years this has been the trouble for occasional 212 codes. The usual problem is fuse #4, either blown or just crusty on the ends, so my approach would be to simply check for battery on the fuse terminal on the right side of #4. This fuse protects the wiring to the oxygen sensor and to the tank's fuel pump. Neither the sensor's heater nor the tank pump is necessary for the car to be driveable."

Agreed. I tend to try to include as much of a circuit as possible, but with a "usual suspect" (the fuse), it's perhaps quicker to focus on that first.

Looks like you have some sort of heat shield there in that photo. It's something mine doesn't have (nor did my previous 92 245).






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