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2015 Mustang GT Convertible engine wiring harness short / melt

dabump

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Jan 24, 2020
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Sydney, NSW
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Martin Coetzee
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2015 Mustang GT (S550) Convertible
Good morning all. First post here. I want to find out if anybody had a similar issue to what I'm having.

In December 2019 (less than a month ago) I bought a 2015 Mustang GT convertible (S550) from a Ford dealership in Armidale, Australia. It was the dealer principles own car and had around 11k km, and visually in really good condition. The owner really looked after the car and looked brand new.

After my drive home to Sydney (around 2 days after the purchase), the 'Check Engine Light' came on. I've got one of those Bluetooth OBD scanners, and the error code was P0152 (O2 sensor).

At first, I cleared the code to see if it comes back, and almost immediately after I cleared the code, the computer would warn that it's in a pending state, and after a couple of start cycles, will confirm the error code, and the check engine light will come on again.

This car is under warranty, so after the first two visits back to the dealership, the car was booked in for replacement of the O2 sensor. That arvo when I picked up the car, check engine light was on again. The car has gone back now for the fourth time, and this time around, the inspection revealed that the engine wiring harness melted and the whole thing needs to be replaced. The car is currently at the ford dealership in castle hill and will take a week to replace the harness.

Has anybody experienced or heard of something similar to my issue? I am however losing faith in the long term reliability of the car now. The positive experience for me is the way both dealerships are treating me. Very helpful and with respect, which I appreciate.

Martin
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Lime1GT

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Winnipeg, Mb. Ca.
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Thomas
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2017 Mustang GT PP
Was the first two visits for the same issue? If so the dealership didn't do a very good diagnosis of the malfunction. They merely threw a part at it and never proved out the repair, hence the check engine light after you picked it up, or they damaged the harness when changing the sensor creating the melting. The harness could have melted from external issues. You don't know what was done to your used car before you bought it. For example, If it was in for an issue where the harness was disconnected for service or an aftermarket part, it may not have been refastened or left laying on a hot exhaust pipe and rubbed through the casing creating a short, burning the wiring and creating the engine code. I wouldn't be worried about the reliability yet. Harnesses rarely short out.
 
 




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