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Old 05-08-2005, 07:11 AM   #1
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Check Engine Light

I was driving in the rain yesterday on the highway going about the speed limit when my check engine light came on. My car has ~45k miles on it, I haven't really abused it and it's hasn't had any major problems (thank god). My question is, could it be a faulty sensor because it it hasn't changed the way the car drives at all that I can notice. What sensors are on the car that would trigger this check engine light to go off. And is it possible to reset this light without having to go to the dealership?


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Old 05-08-2005, 08:20 AM   #2
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Go check what code was thrown, and to clear the ECU, unhook the battery for 10 min, hold the brake pedal in for 30 sec or so after 10 min is up and then hook up the battery
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Old 05-08-2005, 08:31 PM   #3
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just go to autozone, or a similar autoparts store. Most of them have the generic scanners that will read codes, and clear them. Usually they won't charge you.
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Old 05-09-2005, 10:25 AM   #4
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Yeah, just go to autozone and have the code read for you..........if your downward o2 sensor hasn't gone bad yet, that might be what's wrong........
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Old 05-09-2005, 02:31 PM   #5
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Yep that's definitely what it is. I went to a nearby Advance Auto Parts store and they checked it for me. It says P0133 O2 Sensor CkT Slow Response (Bank 1 Sensor 1). He said check the manifold sensor (Not sure if it's the exhaust of intake). Any clue
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Old 05-09-2005, 02:50 PM   #6
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O2 sensors are only on the exhaust. get a new upstream O2 sensor.
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Old 05-09-2005, 09:52 PM   #7
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I got the same code after powerwashing the underside of my car. I checked it and cleared it with my Predator, and it has not come back - in over a month. You say you were driving in the rain when it came on.

Maybe it shorted from moisture? That's what I think mine did.
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Old 05-10-2005, 10:28 AM   #8
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Fordson Yea I'm thinking that's what it did. If it's in the exhaust how far upstream is it? I found one O2 sensor at the bottom of the exhaust just before the cat is this the one i'm looking for or is it closer to the exhaust manifold?
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Old 05-10-2005, 10:59 AM   #9
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Should be one right after the cat as well.
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Old 05-10-2005, 12:32 PM   #10
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okay, but based on the read out the one I"m taking out is the one upstream from the cat right? (the one that's easier to reach)
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