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adamsimp,

 

These are the items that come up for a code P0028.

 

Possible causes

- Dirty engine oil

- Low engine oil level
- Faulty intake valve control solenoid
- Intake valve control solenoid harness is open or shorted
- Intake valve control solenoid circuit poor electrical connection            
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the car is in limp mode.

 

If the car has been well maintained and oil level/quality is good and there have been no wrecks/recent repairs (have there?) , I would start by clearing the code. A code reader can do this - or, disconnecting the neg. battery terminal, stepping on the brake pedal a coupla times, and maybe also waiting 10-20 minutes (or, disconn. neg. batt. terminal at bedtime, re-conn. in the morning)

 

then, see if the code comes back immediately. If it does, probably needs the attention of a mechanic that could properly diagnose it according to the factory service manual.

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Ths is interesting. I had a customer in my oil ship that had this code the day after her oil change. Did you do an oil change? I suspect the code was dripped in the mmentary pressure loss during the initial startup after changing the filter. Prime your filter, folks!

 

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