O2 Sensor Heater Relay - BMW Forum - BimmerWerkz.com
3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

 
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#1 (permalink) Old 05-10-2005, 09:40 PM
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I have an '88 325is -- great car with about 200k miles on it. The Check Engine light came on recently and blinked the O2 sensor code (2 blinks). Given the age of the car, I just went to the dealer and got a new one. After installation, I cleared the fault light, but it came on again as soon as the car began to warm up. I have cleared the fault several times, with the same result -- the check engine light comes on -- not immediately, but as the engine warms up. The voltage output of the O2 sensor seems OK, but I get no voltage from the heater wires. I understand this indicates a bad O2 sensor heater relay. Could this be the cause of the Check Engine light? If so, where is the relay?
Thanks for any advice or help.
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