2004 Nissan quest P0303?

Question

My 2004 nissan quest used to shake once in a while with no check engine light, today it's shaking continusely with check engine light on, i scaned it and it's showing P0303, do you please have any idea what the problem might be? i hope it's just the coil needs to be replaced or the injecter needs to be cleaned since i replaced the spark plugs from the dealer last year. i also got a code P1800 that's not making the check engine light to come on, i've had it last time i scaned the car just to see if i could get a code because i'm getting a rough ride when i drive up on the hill, the RPM gets up to 4000 and the engine gets noisy. Thank you very much

Anonymous · Accepted Answer

P0303 Code - Cylinder #3 Misfire

Technical Description Cylinder #3

Misfire Detected What does that mean?

A P0303 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #3.

Symptoms

Symptoms may include: the engine may be harder to start the engine may stumble / stumble, and/or hesitate other symptoms may also be present Causes A code P0303 may mean that one or more of the following has happened:

Faulty spark plug or wire 
Faulty coil (pack) 
Faulty oxygen sensor(s) 
Faulty fuel injector 
Burned exhaust valve 
Faulty catalytic converter(s) 
Running out of fuel 
Poor compression 
Defective computer

Possible Solutions

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back. If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

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2004 Nissan quest P0303?

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