Upstream o2 sernsor
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Joined: Jan 2004
Posts: 19,768
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From: St Louis
guy at part store said they've had plenty returns on them?
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Trailering
Joined: Jul 2023
Posts: 21
Likes: 3
2013 f250 6.2 4x4 (276,000 miles)
I did go get a scan. Came up with misfires in 2, 5 and 7. Also catalyst system below threshold banks 1 and 2. Bank 2 air-fuel ratio imbalance. I had a bad exhaust manifold so started with changing that out. Still light was on. So then went to changing out plugs and wires, reset computer. Ran with no light until I stepped on it. Engine light flashed then stayed on. Got back under hood noticed that thermostat was leaking a little fluid so changed that. Also got Bosch upstream sensors. Replaced them. Did fine on test drive last night and even got on it a bit. I still could feel the engine wasn't right. So now I guess its going to looking into coil packs. Anyone else have any suggestions?
3rd Gear
Joined: Jul 2025
Posts: 3
Likes: 1
One of the things it could be is that the catalytic converters could be clogged up and not allowing for proper air flow for the exhaust. I had a similar problem and found that my O2 sensors were pretty much gone and the cats were very very clogged up. Once i changed it out and got stock oems i put my foot into it and i saw the difference it made.
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Trailering
Joined: Jul 2023
Posts: 21
Likes: 3
It turned out to be as simple as the purge valve. It was stuck open. I did more research and came across this so I thought what the hell ...I'll check it out. It was simple to test it and sure enough it was stuck open.
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