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GARYA
Dodge Dakota
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9/28/2005
05:46:28
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 Subject: ANYONE EVER HAD THIS SENSOR PROBLEM????
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Hi everyone, Has anyone ever had a bad sensor on there dodge truck that just was not sending the right information to the computer but yet there is no check engine light on of anykind? Anything at all from the oxygen sensor on up? Any comments would be great. Thanks.
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??
Dodge Dakota
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9/28/2005
08:37:09
|  RE: ANYONE EVER HAD THIS SENSOR PROBLEM????
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Never had it happen to me, but have heard of the sensors starting to go bad or being bad with no check engine light or codes showing up using the check method of turning the key three times.
Take it to Autozone and have them perform the check for free and see if anything shows up.
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Kowalski
GenIII
9/28/2005
18:44:06
|  RE: ANYONE EVER HAD THIS SENSOR PROBLEM????
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No, why do you ask ?
Lead, follow, or get out of the way
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GARYA
Dodge Dakota
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9/29/2005
02:20:53
| RE: ANYONE EVER HAD THIS SENSOR PROBLEM????
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Motor is running a touch to lean. If I am very light on the gas pedal it will ping, as soon as I touch pedal and give it a little shot of fuel it goes away. Also when it is cold and the computer is running it a little richer until it warms up it is fine, soon as computer leans it out it goes a little to much. No lights on for sensors bad. That is why I ask. I just dont want to start changing sensors without any solid info. Thanks for reply.
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davec
Dodge Dakota
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9/30/2005
15:02:07
| RE: ANYONE EVER HAD THIS SENSOR PROBLEM????
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This is a very possible situtation. Check this out. I had a Dakota giving me trouble once. It was hard starting when cold (winter). Here I found that the temp sensor was reading (around) normal operating temp all the time. The computer saw normal temp, and leans out the fuel system accordingly. So much that the darn thing wouldn't start. Computers see 3 things when it comes to sensors. They look for a signal (no signal = code), they look for a voltage high (open circuit = code) or a voltage low (shorted circuit = code). What the computer can't see, is if the reading it is getting is correct. As with the temp sensor...operating temp looked normal to the PCM so it did it's job and leaned out the fuel system. It had no idea it was being started cold. Same thing happens to TPS sensors, they go bad and often don't set a code. The PCM thinks you're touching the gas and raises the idle. Also, O2 sensors often get lazy and hang to the lean side or the rich side (may be your problem)
But to answer your question, yes you can have a bad sensor without a code.
dave
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