Code p0304 misfire e 320 mercedes 1997 - 2003 Audi A4 Cabriolet

Question edited for clarity and the typos - Nissian, cyclinder, vam, and PO 304 is P-zero not P-letter Oh..
Question moved to model category

What makes you think it is the Crankshaft Sensor? This is a simple misfire on Cylinder 4. Check plug, leads and coil. Run some Injector cleaner.

The P0304 code stands for "Cylinder 4 Misfire Detected", which means your vehicle's cylinder 4 has misfired enough times for your powertrain control module (PCM) to notice. A worn spark plug, a faulty fuel injector, and a leaking valve are some possible causes of the P0304 code.
Jul 28, 2023

P0304 Code: Cylinder 4 Misfire Detected - CarParts.com

https://www.justanswer.com/nissan/58ol6-2004-nissan-quest-5spd-where-crankshaft-sensor-located-diy.html

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Try this site for misfire codes and their diagnosis:

P0308 OBD II Trouble Code

also here:

Trouble shooting misfire Code P0300 P0301 P0302 P0303 P0304 P0305 P0306...

and herea;

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A code P0304 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.

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/wires). 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 equipped). Otherwise, check the coil packs. Sometimes the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your catalytic converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

I think this is a Coil problem. try replacing coil. If not, it is a MAF problem. 06 wire should still be fine now.

p0304 misfire on cylinder #4
p0325 knock sensor circuit

Could be a bad wire, plug, or coil pack on cylinder #4 (or bad distributor connection).

Knock sensor indicates a knock coming from the engine, perhaps from cylinder #4.

This may lead to a diagnosis if you change parts related to cylinder #4.

Good luck.

I'd have fuel pressure checked, and at the very least, replace fuel filter. Not unusual to get multiple misfire codes due to low fuel pressure, thus starving cylinder(s), and causing the misfire code(s).

P0301 cyl 1 misfire, P0304 cyl 4 misfire, P0305 cylinder 5 misfire. Possibly the ignition module.

p0304 means the computer has detected that cylinder 4 is misfiring. the most common cause of a misfire is a faulty spark plug or plug wire. depending on how long its been since a tune-up, they could just be worn out. you can look at where the plug wire snaps onto ignition coil to see if the coil tower is corroded, also another cause. other causes of misfire in one cylinder could be a faulty fuel injector or low compression on that cylinder. but ignition is the most common

p0340 cyl 4 misfire /check plug /wire /distributor cap/ injector

well the codes
p0300 multiple misfire
p0303 misfire cylinder 3
p0304 misfire cylinder 4
p0307 misfire cylinder 7

can be alot of things check cylinders for compression is what i would do first..