Obd1 pr4 ecu convert to 4 wire o2
 

I belief I read you need to add a resistor some where but cant find the post. Thanks for any info

Re: Obd1 pr4 ecu convert to 4 wire o2
 

Wasn't aware you needed to do that on a PR4 but here is the link. http://www.pgmfi.org/twiki/bin/view/...o4WireO2Sensor

Re: Obd1 pr4 ecu convert to 4 wire o2
 

92-93 PR4's were all 4 wire already.

only the P05 ECUs need that...