A weak or failing fuel pump can cause power loss due to lower fuel pressure and lean mixture conditions. This rarely causes a Check Engine Light to illuminate and should be repaired to avoid catalytic converter damage.
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Newest reported 2009 Nissan Titan problems
Overheating and/or lack of proper venting can cause the rear axle seals to leak. Excessive fluid loss can result in major damage to the rear differential assembly and/or axle bearings.