Mercury Repair Questions? Ask a Mechanic for Answers ASAP
If your purge valve is stuck open it could be affecting the o2 sensors. It will be a vacuum leak and cause a lean code p0171 and p0171. Do you know which code for the oxygen sensors were there?
A faulty purge valve could cause an evap leak which would set the light for the gas cap as well.
Please reply to this if you need more help and we can continue this conversation. If you are satisfied with my service, please rate at the top of the screen. Rating does not close out your question. Remember, sometimes it is difficult to completely diagnose your vehicle without being there, but I will try to give you the best answer I can. If I am not giving you 5 star service, please let me know what I missed.
ASE Master Technician
Have you check the wiring closely especially near the exhaust? Sometime wires can get melted from the heat of the exhaust. Look at the engine harness carefully for signs of rodents. Sometimes mice will chew through the harness as well.
Clear those codes out, turn the key on without starting. Rescan. Which codes come back?
Start it up and let me know which codes come up.
Does it have any running issues?
It may take a few drive cycles to set the light
Is your scan tool able to read live data?
Live data is not really a test, can you see the heater circuit voltage of the o2 sensors with the scan tool?
Do you have a multi meter? Are you able to do some electrical tests with a wiring diagram?
Hello again Dan here,
I am contacting you because the post has not been closed or rated.
This question is coming up on 7 days which means it will close.
You have already paid to get this question answered, but you have not rated.
Let me help some more. Is there anything else I can help you with?
If I did not give you 5 star service, please let me know what I missed.
I do not get compensated for my time and resources unless you rate me.