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britta ... 1/9/2013

1999 Nissan Maxima GLE 6 Cyl 3.0L


Check engine light on. Failed inspection. Two codes P1320 and P0304.

The car runs fine to me but the check engine light resuts in a failed inspection. I have researched these codes and all i see is info on coil #4 misfiring. I would like to know the cost of this repair and if that is indeed the problem with my vehicle

1 Answer


Jimm 1/11/2013

P0304 = Cylinder #4 misfire
It 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.

P1320 = Ignition Control Signal Circuit Malfunction

Possible Causes:
Ignition coil primary circuit is open or shorted
Ignition coil condenser is shorted
CKP (crankshaft position sensor) signal is erratic or missing
CMP (camshaft position sensor) signal is erratic or missing
CKP sensor or CMP sensor is damaged or has failed.


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