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Correct. the PCM was the Final problem. The other stuff was also bad so I may have been the one who broke the PCM. PROBLEM SOLVED.

Could not find someone with a scan tool. I saw the other post and called a dismantler today and found one for $50. he was even good enough to let us plug it in and try it. WAIT FOR IT and it did not flash a light. drove to the smog center passed smog problem solved in my book. Thanks for all...

I hope it's fixed. I ran the test to completion and then shut it off then removed the wire. Did not fix it. still goes into test mode on start up. I will look for a scan tool tomorrow. Thank You for the help. I will keep you informed.

fuel rail stays over 30 for more than 5 min. FPR was replaced yesterday. it has vacuum. MAF has .7v @ idle and 2v @ 4000RPM DPFE has .5v. are the hoses attached to it supposed to have vacuum? neither of these have vacuum @ idle.

is the vehicle supposed to go through the motions of self test every time you start it without the jumper wire?

Thank you. We just replaced the plugs (last weekend) and I have rechecked the wires they seem to be ok. I left the battery disconnected over night (should clear the codes) when I got in and started it this morning it went through the self check? and the 173 was still there? do I need to put...

I have read the posts on the 173 code on the 94 explorer 4.0. I have replaced both the O2 sensor on the rt (passenger) side and the FPR. Left the battery disconnected for almost an hour after replacing the parts. Drove it for 10 minutes and the CEL came on. To my surprise the code 173 came back...