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So Now What??? 900 1992

posted by  Jerry Warren on  Fri Dec 28 16:25 CST 2001
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last visit: Tue Sep 2 17:06 CST 2008
[RELATED]

When you checked the O2 sensor, what made you think it was questionable. I beleive the voltage readings should be between .1 & .9 volts and if the signal goes high(1.1) or low(.09) for too long a period or if the sensor voltage does not delivers its average 0.5V (signal absent 3 minutes after the engine temperture reaches 167F and a certain amont of load has been experienced then you get a 212 code.

Signal too high
signal lead short-circuited to live
Defective O2 sensor

Signal too low
Signal lead short-circuited to ground
Defective O2 sensor
Air leakage or fuel pressure too low
Faulty MAF sensor signal

Signal absent
Break in signal lead
Break in power lead
Break in ground lead
Contact Resistance in connections
Defective O2 sensor

Fault Sympton
High fuel consumption

Don't use releasing spray or oil on the O2 sensor connection

This should help you get started on finding a solution. Good Luck

I replaced my sensor based on the advice of the mechanic working on the car and still wound up with 2-1-2 codes. Sometimes like you within 6 miles and other times 100 to 500 miles. The true problem turned out to be a bad connection in one of the relays next to the DTC( one of the relays was reported bad so I went ahead and replaced both) and once that was corrected, I haven't seen the code in 5 months.






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