need help O2 sensor problem - BMW Forum - BimmerWerkz.com
5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

 
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#1 (permalink) Old 12-12-2009, 03:52 PM
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need help O2 sensor problem

91 E34 525 M50
fault code 70 O2 sssensor circuit problem
replaced O2 twice in a 3 month period to rule out O2

i have a problem with my O2 the heater relay wont send the 12 v to the heater , but the relay is good the wiring to the O2 is good. the voltage and ground on the relay plug are good but the ecu wont close the realy . if you have dealt with this problem before please let me know.

thank you
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