Have the computer scanned (see my tips and tricks section for a free way to do so - click my screenname and go to Tips and Tricks). There are either latent codes (codes which are set but are not tripping a check-engine light) or you have an issue with a readiness code.
Once the codes are scanned, post them here as a reply/comment and I can work with you on solving the issue.
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what are the system fault codes? if u don't know have it tested.
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