© DenLorsTools.com Summary: In this article we point out a common problem with Nissan automobiles equipped with the 3.5 Liter engine that causes engine tapping noises typically on cold start up. The engine has variable timing cam sprockets, three timing chains, three tensioners and three guides. Vehicles subject to similar issues may include Nissan Altima, Maxima, Murano, 350Z, Infiniti G35, G37, EX, FX, M series and QX4.

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2003 Jeep Grand Cherokee 4.0 Liter Engine with a P1281 Code.

This automotive repair article is on a specific check engine light code for a Jeep Grand Cherokee. When scanned with an automotive scan tool, a P1281 fault code was retrieved. The code has to do with the engine not reaching operating temperature within a certain length of time after the vehicle has been started. For the catalytic converter to operate at it’s best the engine needs to reach it’s normal operating temp. The cooling system’s thermostat normally stays closed when the engine is cold, allowing the motor to warm up quickly. That’s why the trick of removing the thermostat to let the car run cooler, like back in the 1970’s (prior to on-board computers) doesn’t work well anymore.

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