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Can you tell me which fault codes were set? There are numerous camshaft related fault codes that can set.
P0455 is for a large evap system leak which can be caused by something as simple as leaving your fuel cap loose or a failure in the evap control system.
P0017 is a fault stored indicating a correlation error of the rear bank of cylinder camshafts. The exhaust camshaft is not in sync with the other camshaft. There is no timing belt in this vehicle. It is a chain. This fault is not caused by a fault in the camshaft position sensors but by the camshaft being in the wrong position either by being mistimed, a worn or stretched timing chain, or a failed camshaft phaser. This can be read on a proper scan tool. The camshaft can be commanded to move each way and the commanded and actual position noted. If this occured only after an internal engine repair then it is likely timed incorrectly. If the p0017 did not occur after an internal engine repair then it is likely caused by a stretched chain (which there is a technical service bulletin on) or a failed camshaft phaser. Your 07 came with a 5 year 100,000 mile powertrain warranty that should cover chain related repairs. If you provide the last eight digits of your vin, I can check that for you.
If the p0017 is setting then there IS an issue with the camshaft timing, the chain or the phaser. You can't tell length by looking at it. The Warranty in effect till jan 25th 2012 or 104603. The proper way to diagnose this would be to read the camshaft positions with a scan tool. If the actual and commanded positons are the same and the p0017 is still set then a stretched chain is by far the most probable cause. If the commands are not matched then a camshaft phaser or low oil pressure causing the phaser not to work properly is present. Lack of maintenance or oil sludge build up would make this even more likely.
Bill 2007 Saturn AURA | AURA, BAS Hybrid (VIN Z) Service Manual | Document ID:(NNN) NNN-NNNN/p>
#07-06-01-014: LY7 MIL/DTCs P0016, P0017, P0018 or P0019 - Stretched Primary Drive and Both Secondary Drive Timing Chains (Replace Primary Drive and Both Secondary Drive Timing Chains) - (Jul 1, 2011)
Some customers may comment on the Malfunction Indicator Lamp (MIL) being illuminated. Technicians may find the following Diagnostic Trouble Codes (DTC) stored:
The cause may be a stretched primary drive and both secondary drive timing chains.
Refer to SI for the following diagnostic information if only one of the following DTCs are set:
If there are more than one of the above mentioned DTCs set, inspect the timing chains for being stretched. Refer to Camshaft Timing Drive Components Cleaning and Inspection (Fourth Design) in SI.
Important: For demonstration purposes - The 3rd design chain (1) was never used in the models mentioned in this bulletin.
The above illustration shows the 3rd design roller type chain (1) (for model years 2005-2006 - LY7) and the 4th design link type chain (2) (for model year 2007 - LY7).
It may take several thousand miles of use before the timing chains begin to stretch. Inspect both the primary drive and both secondary drive timing chains for the following conditions:
If any of the chains are stretched, replace the primary drive and both secondary drive timing chains only. Do Not replace any of the other timing chain component parts.
For vehicles repaired under warranty, use: