O2 Sensor question - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
 
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post #1 of 5 (permalink) Old 02-11-2007, 01:27 AM Thread Starter
 
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O2 Sensor question

I've read on these forums recently that failed O2 sensors can prevent the car from starting. Is this true? Doesn't sound right to me.
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post #2 of 5 (permalink) Old 02-11-2007, 01:31 AM
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Might want to link to those threads so we can debate it. Sensors shouldn't be no start item. Definately a CEL item though after you start.
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post #3 of 5 (permalink) Old 02-11-2007, 01:50 AM
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Agree with Ronbo. An 02 sensor is not capable of causing a no start condition.
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post #4 of 5 (permalink) Old 02-11-2007, 02:26 AM
 
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the car starts in open loop mode and doesnt get any readings from the o2 sensors until it goes into closed loop mode in which the engine has to get to a certain temp. for a certain amount of time. In open loop it determines the air/fuel ratio using other sensors such as the coolant temp sensor.
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post #5 of 5 (permalink) Old 02-11-2007, 08:21 AM
 
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Quote:
Originally Posted by Emerica2843
the car starts in open loop mode and doesnt get any readings from the o2 sensors until it goes into closed loop mode in which the engine has to get to a certain temp. for a certain amount of time. In open loop it determines the air/fuel ratio using other sensors such as the coolant temp sensor.
Yes and no. The heated O2 sensors are used so the pcm can go into closed loop much faster, well before the engine is up to normal operating temps. The non-heated O2's took awhile to put the pcm into closed loop because they needed to reach around 600 F before they actually gave a usable signal.

But agreed with both of you, I don't see how an O2 malfunction could cause a no start condition, except....

Getting back to the heated O2's. The circuit for the O2 heaters might be the same as the circuit for the coil(s) and/or fuel injectors, so if there was a short in the heater of one of the O2's, then I could see where a no start condition could be caused by a bad O2. I don't know what year/engine the OP is talking about so I can't look up wiring diagrams. But I think the O2 heater circuit might be on the ASD relay circuit and I think so are both the ignition coil(s) and fuel injectors.
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