I had a P0171 lean condition bank 1 code after having starter, timing belt, valve covers gaskets, and spark plugs replaced. Found cracked PCV hose, and replaced PCV hoses, grommet, valve, and fuel filter as preventative maintenance, and the code when away for a day. The following day the check engine light came on. I was sure it was going to be the same code but it was not. I now have a P0325 knock sensor code. I have reset it and it comes back after driving a mile. Truck idles fine with no rough idle like it did when it had P0171. I looked with a flashlight and both knock sensors seem to be connected. I will not be a happy camper if the intake needs to come off again. I am hoping they did not mess something up when the starter was replaced. Looking back I should have preformed this repair myself, but didn't due to the work involved and time. Is there anything that can be checked prior to removing the intake. I don't think the sensor are bad more like a circuit issue, but i could be wrong. I don't want to take things apart if it isn't necessary and also avoid having to order another set of intake plenum gaskets. 
I had just replaced the clock spring and all that remained on my long list was to replace diff fluids and grease driveshafts.
I had just replaced the clock spring and all that remained on my long list was to replace diff fluids and grease driveshafts.
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