On any 1996-2009 vehicle with variable valve timing, if the MIL is on with any of the following DTCs stored: P0011, P0014, P0021, P0024, P1110 or P1135, do not replace the variable valve timing solenoid valve or the sprocket(s) without performing the complete diagnosis indicated in the EC section of the service manual.
Note: The engine may also have camshaft sprocket rattle noise and/or other engine noise.
The first steps in the complete diagnosis are to make sure the:
• Engine oil is at the operating level; add oil if needed. Refer to the service manual for low oil level diagnoses, if needed.
• Oil pressure is normal when measured with a gauge at the pressure switch port. Refer to the service manual for low oil pressure diagnoses, if needed.
Technical service bulletin courtesy of Mitchell 1.
For more information on Mitchell 1 products and services, automotive professionals can log onto the company’s website at www.mitchell1.com.