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OBD socket 2, 2-1-2, 02 sensor ... after repair DTC resets or clears automatically? 200 1989

uid 27's pic
posted by  Art Benstein on  Mon Jan 18 05:59 CST 2021
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last visit: Fri Oct 17 20:10 CST 2014
[RELATED]

Chime in: An oxygen sensor needs heat. Most common cause I've seen for 212 is fuse 4. This fuse protects the tank pump and the oxygen sensor's heater circuit. The tank pump can be inoperative without you being aware.

Check to see if the heater is working by measuring the resistance toward your new sensor at the connector under the windshield wiper motor. Check it cold, before you start the car, then check it immediately after shutting off the engine just warmed up. A good heater circuit will show a high value like 13 ohms slowly decreasing to a cold value around 3-4 ohms.

Fuse 4 can be blown or just crusty.
--
Art Benstein near Baltimore

Eat, drink, and be thoughtful.






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