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Peter Bagley
Peter Bagley, Toyota mastertech
Category: Ford
Satisfied Customers: 723
Experience:  master tech at Toyota dealer
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I just purchased a 1998 ford mustang GT convertible 4.6L

Customer Question

I just purchased a 1998 ford mustang GT convertible 4.6L with 170K miles the car need gas it had apparently sat for some time so I filled it up with fresh gas and not even a mile down the road I get a check engine light I have a scanner and now I have a code of P1131 along with P000 what is that and do you know much about the mustang year I have
JA: Does the light stay on, or does it blink?
Customer: stays on vehicle is running fine also
JA: What year is your Convertible?
Customer: 1998
JA: Are you fixing your Convertible yourself? What have you tried so far?
Customer: no I have someone do it
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 11 months ago.
Category: Ford
Expert:  Peter Bagley replied 11 months ago.

Hello and welcome to just answer and allowing me to assist you. the problem code P1131 is for the upstream A/F sensor P1131 Possible causes:
fuel system these are possible causes but in your situation I would try a good injector flush or cleaner like LUCAS INJECTOR CLEANER. to see if that will settle it down or you may have to replace it. The other code P000 Is not listed and could very well be a generic incomplete search by the ECU When you erase the codes it probably won't return.
- excessive fuel pressure
- leaking fuel injector(s)
- leaking fuel pressure regulator
- low fuel pressure or running out of fuel
- contaminated fuel injector(s)
- vapor recovery system
induction system
- air leaks after the maf.
- vacuum leaks (lines or gaskets)
- restricted air inlet
- pcv system
- vapor recovery system
egr system
- leaking gasket
- stuck open egr valve
- leaking diaphragm
base engine
- oil overfill
- cam timing
- cylinder compression
- exhaust leaks before or near the HO2Ss
* check intake air systems for leaks, obstruction or damage
* check air cleaner element, air cleaner housing for blockage
* verify integrity of the pcv system
* check for vacuum leaks P0131 Upstream Heated Oxygen Sensor circuit out of range - Bank No. 1. Hope this helps your problem and if you need further assistance I'll be happy to do so. Please give my answer a pos ratting, thank you.