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The O2 Sensor has nothing to do with Cold Start (archive)

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Posted by Thomas Meacham on October 09, 2001 at 19:06:45:

In Reply to: What are the symptoms of bad O2 sensor? posted by Adrian Lee on October 09, 2001 at 16:29:53:

After the car sits for a while, the fuel might drain back to the tank. The car gets harder to start the longer it sits. Once it starts, the fuel rail purges within the first 2 seconds, but the injectors take longer. So it runs rough. On the other hand, leaky injectors will exhibit similar symptoms except the leave unburnt gas in the intake runner or cylinder. Once the car starts, the gas moves down through the cylinder and still unburnt into the exhaust manifold. Then who knows when it will burn.

I wouldn't replace the O2 sensor without putting a scope on it. Usually the O2 sensor message indicates that there is a bad connection to the O2 Sensor heater or the Measurement Loop.

Happy Hunting,

Tom


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