What is the main problem for p0300 on 02 Altima 2.5


Asked by Aug 09, 2015 at 02:45 AM about the 2002 Nissan Altima 2.5

Question type: Maintenance & Repair

I put new spark plugs in last month
change two out of four coil packs an
car is worst than before hesitate in
drive with foot on brake blinking
engine over a certain speed I need to
know what is the main problem

14 Answers


Have the catalytic converter checked


I changed the cat 2 months ago


Do you think it's the 02 sensors? Maybe


Usually when the check engine light is blinking that a sign of the catalytic converter so I would have the code read with a scanner to see exactly what the problem is.


Yea code came back as p0300 multiple misfire


Hi nice to meet you. The p0300 is a DTC for multiple missfire. You say you change the sparkplug and two coils, and check the catalitic converter. Ok. You need to verify the knock sensor, the cam sensor, the flow meter, and map sensor. You need to scan the car and take fuel pressure maybe you have poor fuel pressure.

1 out of 1 people think this is helpful.

Nice to meet you 2 I change cat but I didn't put new 02 sensors in you think that might be it


The o2 sensor or EGO sensor don't cause a PO300. If you have this kind of dtc the pcm is trying to say all cilinder are not firing good. You need to find the reason for all cilinder missfiring. The cat can do this problem but you are readi change. The other thing can do this is a bad knock sensor or a poor fuel pressure.


Verify you don't have a bad air leak in the multiple or air induction system. A broken air house etc.


Ok Ima check it out is there any thing I can do to fix till next week? Until I fix if


Can I try motor treatment?


Maybe. But you need to scan your car again. I think you have fuel pressure problem. You can fill the gas tank in a half with gasolin obvius and add an half of 1qt of transmission fluid IN THE FUEL TANK. The transmission fluid have cleanin properties and don't damage your fuel injectors and rise your fuel octane dont't damage. If don't help don't damage. Don't worry. But i still think you have fuel pressure problem or maybe with knok sensor, cam, or pcm. Thath wy you need to scan.


Ok thanks I been seeing stuff about seafoam


Check your firing order make sure you didn't wire it back up wrong after changing plugs have you looked at your dstributor cap and rotor button if not i would but for real dude it sounds like you put the wires on the plugs wronge after u changed the plugs and wires and if u used the old wires you may have riped the metal tab that connects the plug to the wire and they might be bad signal inside the boot change wires and make sure order is rite

Your Answer

Add photo

Related Questions


Looking for a Used Altima in your area?

CarGurus has 87,445 nationwide Altima listings starting at $1,095.


Search Nissan Altima Questions

Nissan Altima Experts

#1 Tom Demyan
Tom Demyan
Reputation 1,760
#2 FordNut
Reputation 1,120
#3 Cassie Sapphire
Cassie Sapphire
Reputation 530
View All

Related Models For Sale

Used Nissan Maxima"
495 Great Deals out of 24,224 listings starting at $1,500
Used Honda Accord"
1,255 Great Deals out of 78,694 listings starting at $1,400
Used Toyota Camry"
1,587 Great Deals out of 98,372 listings starting at $895
Used Honda Civic"
1,146 Great Deals out of 59,092 listings starting at $995
Used Nissan Sentra"
859 Great Deals out of 49,793 listings starting at $500
Used Toyota Corolla"
1,407 Great Deals out of 67,100 listings starting at $1,295
Used Hyundai Sonata"
968 Great Deals out of 51,469 listings starting at $1,200
Used Chevrolet Malibu"
1,148 Great Deals out of 73,044 listings starting at $695
Used Kia Optima"
603 Great Deals out of 31,664 listings starting at $1,700
Used Chevrolet Impala"
932 Great Deals out of 35,698 listings starting at $1,500
Used Nissan Murano"
425 Great Deals out of 21,723 listings starting at $1,295

Used Cars For Sale

2017 Nissan Altima 2.5 For Sale
533 listings starting at $17,606
2016 Nissan Altima 2.5 For Sale
5 Great Deals out of 951 listings starting at $11,773
2015 Nissan Altima 2.5 For Sale
54 Great Deals out of 1,483 listings starting at $10,979
2014 Nissan Altima 2.5 For Sale
14 Great Deals out of 558 listings starting at $9,499
2013 Nissan Altima 2.5 For Sale
48 Great Deals out of 2,160 listings starting at $4,700