Failed Emissions

[jar2187]

I have a 96 5.0 awd limited, the check engine light has been one for sometime now, and i am getting very bad gas mileage, about 12city 17 on highway. I used to get 21 on the highway city was about 15-16 . The code is p0340, camshaft position sensor. Well it failed emissions so they wont inspect it. Reading all these threads on how changing the sensor still doesnt fix the problem, I don't know what to do. Any have any ideas?

 

[MONMIX]

the light is the reason they wont test it. Make the problem go away and you will be fine.

 

[jar2187]

I knew that, but not until after I took it... What is the problems thats my question.

 

[Bigg_billy]

How many miles on the truck, if it's over 65,000 the O2 sensor is likely gone and won't always set a code. If the code is cam position sensor, reset the computer and see if that code comes back again, if so change out the sensor.

 

[MONMIX]

much of the time the sensor is only the messenger, not the culprate. Unless the 0s's are talking to you I would leave them alone.
Let me look at my code book tomorrow and get back at you.

 

[aldive]

How many miles on the truck, if it's over 65,000 the O2 sensor is likely gone and won't always set a code.

Not necessarily true. Many O2 sensors last a very long time. In fact mine are going on 120K now.