Where are the ignition coils located?

code 1320 refers to ignition signal---circuit malfunction====causes --wiring---ignition coil/ module---ignition system--crank position sensor ---ECM

Replace the starter. It's not a coil, it's the solenoid. You can't get it without the starter.

0300 the dreaded multiple misfire code
0325 knock sensor
1320 ignition signal
Have you replaced the knock sensor(s)? Tested ignition module? Note: even if module tests good, it may still be the problem. Tests are not conclusive. Bad ground somewhere?

430 is Oxygen sensor

0305 is misfire on cylinder 5

1320 is ignition coil.

The ignition coil is causing the misfire. That is causing rich mixture which could case the oxygen sensor issue. You need to work from the ignition issue to the sensor. The reason is if you replace the cat and the engine is running rich it will heat the cat up to the point that the car might catch fire. Oxygen sensors are also prone to fail after about 60 thousand miles.

(171,172) replace MAF , replace air filter with o.e. type (1130) Check vac. lines and connectors to vac. solenoids
(1320) ignition coil primary failure, if all connections are good, replace all the coils

DTC Confirmation Test Malfunction is detected when ECM does not receive signal from ignition primary circuit during engine cranking or running. Possible causes are:

• Ignition primary circuit open or shorted.
• Defective power transistor (integral with ignition coil).
• Defective condenser.
• Defective Crankshaft Position (CKP) sensor (REF).
• CKP sensor (REF) circuit open or shorted.

Code P1320: Ignition Signal

- Ignition primary circuit is open or shorted
- Ignition primary circuit poor electrical connection
- Faulty power transistor unit built into ignition coil
- Faulty ignition system condenser
- Crankshaft position sensor circuit

The most common cause of the problem is the ignition coils

Did you buy a aftermarket coil...? I have found I have the best luck with electrical parts from NAPA.......That's just me though !!!

You will need to replace all the ignition coils on your altima. Sorry but that is the only way to get rid of that code.

ps Use only nissan coils aftermarket one will go bad fast.

Did you try looking through the fuse panels or relays?