Many of the emissions sensor failures that occur on the Cruze Diesel are speculated to be traced back to un-metered air entering the intake system. One source for this un-metered air could be if any of the 5 hose clamps between the air filter and the turbo inlet are under-tightened. Use the following procedure to locate and check the tightness of these intake clamps:
1. Open the hood - http://www.cruzetalk.com/forum/169-chevy-cruze-diesel-how-diy-library/8538-how-open-hood.html
2. Locate the hose and clamps to be checked - indicated by the circled area in the picture below:
3. Use a flat-head screwdriver or 7mm nut-driver to firmly turn the screws on the clamp clockwise. The location of the 5 clamp screws is indicated in the photo below:
If they move more than 1/8 to 1/4 of a turn, they are loose. If a clamp is lose enough that the duct is able to twist or shift, ensure that the duct is securely positioned before tightening the clamps. Tighten all 5 clamps as firmly as possible. After 3000-5000 miles re-check the clamps to see if they have backed off in that time. If they have backed off, it may be necessary to use blue thread-locker (http://www.amazon.com/Permatex-2401...1451592026&sr=1-3&keywords=blue+thread-locker
) or a similar solution to prevent them from loosening over time.
4. Report your results in the poll at: http://www.cruzetalk.com/forum/64-c...any-under-tightened-diesel-intake-clamps.html