Comments by "crazypj" (@1crazypj) on "Rainman Ray's Repairs"
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I had downstream O2 sensor fail on my 2004 B2300 (Ford/Mazda) at about 80,000 miles.
It would run real rough and actually stop until things cooled down.
O2 sensors only run between 0.1 and 0.9 volts so it's easy to check with just a multi meter and propane torch.
You can measure voltage to see if sensor is working (it won't be dead accurate but shows if it's working, propane has different O2 levels)
Fitted the cheapest 'white box' one I could find and 40,000 miles later it's still running fine.
It has been giving a fuel cap air leak recently, probably needs a new gasket?
When I fitted a locking fuel cap, I got an extra 3 mpg, guess whoever was siphoning gas got bit of a shock?
I guess I could fit the original to see if it makes a difference.
That's using a lot of oil, at 120,000 miles my 2.3 isn't using half pint between changes , I would expect a 5.4, even in a van not to be working as hard (I have used full synthetic since 6,000 miles though, plus had it severely over loaded several times,4 x 340 lb motorcycles in bed, Pontiac 400 engine/transmission, etc)
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