I figured out my obd port and pcm couldn't talk due to a wire at the fuse box now I have these two codes for the O2 sensors can someone tell me where to locate the harnesses, I want to check the wiring and voltage before I just replace the sensors
Anytime the PCM calls out a "circuit Malfunction" this means there something soooooooooooooooo wrong with the circuit that the PCM is unable to perform any diagnosis.
Considering that you have a DTC for both O2 sensors I wouldn't think "bad O2" sensor. Instead think "common cause". IE, power.
Do you have any other DTC codes? Have you confirmed that fuse F2.8 has key on power in and out? If the fuse is good, suggest confirming good voltage and ground at the O2 heater circuit. Best to use a test light that will "load" the circuit.
First off thank you for taking the time to read this, I hope that you will be able to help me out in some way to get a 4 month project off the ground and back onto the streets. I'm not a master mechanic but know just a little bit, enough to do your typical maintenance, overhauls, and swaps. I...
www.allfordmustangs.com
OBTW, it would be handy to mention the model year and engine of the Mustang in question. Saves the people trying to help from guessing.
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During testing the HO2S Heaters are checked for opens/shorts and excessive current draw. The test fails when current draw exceeds a calibrated limit and/or an open or short is detected.
If this were my car I would be checking for power's and grounds (5 volt and 12 volt) to the O2's and DPFE sensor. Verify that the O2 heaters actually work. Verify that the O2 sensor signal is switching.
Do you have an ODB2 scanner? If so, this could make short work of your problem. Here's some information on an affordable ($30) Windows based unit.
While working on your car have you ever wanted: to find an ODB2 operational PID value (say fuel pressure or MAF)? How about graph a PID value over time? Or compare multiple PID's over time? Access a bi-directional PCM control such as test a...
www.stangnet.com
P1151 - Lack of HO2S-21 Switch, Sensor Indicates Lean
If this were my car I would be checking for power's and grounds (5 volt and 12 volt) to the O2's and DPFE sensor. Verify that the O2 heaters actually work. Verify that the O2 sensor signal is switching.
Do you have an ODB2 scanner? If so, this could make short work of your problem. Here's some information on an affordable ($30) Windows based unit.
While working on your car have you ever wanted: to find an ODB2 operational PID value (say fuel pressure or MAF)? How about graph a PID value over time? Or compare multiple PID's over time? Access a bi-directional PCM control such as test a...
www.stangnet.com
P1151 - Lack of HO2S-21 Switch, Sensor Indicates Lean
Thanks for all the help,got those p0155 0135 codes worked out down to the last p1405 its the little pipe off the egr pipe broke off
will try to fit another in or jb quick it