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I've had a busy day troubleshooting the freaking ARC and installing an O2 sensor.

During this I ran a heater wire for the O2 sensor from one of the motronic relays (as on the cars that came with O2 sensor factory). In doing this I noticed that the four Motronic relays should not be the same, one has a diode in it.

Now mine are all the same black plastic relay (I swapped them out during the rebuild). Does anyone have the P/N for the relay with diode?

Richard
 
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