Nissan Forum banner
1 - 5 of 5 Posts

·
Registered
Joined
·
44 Posts
Discussion Starter · #1 ·
I looked through all the previous threads on this forum regarding P0420 and the catalyst system.

My particular problem was a loss of power for about 10 seconds, not complete loss, but very rough, during the loss the service light was blinking.

Everything was fine after that (4WD active, in snow, very cold 15 F degrees).

The light did NOT remain on.. it turned off immediately when normal operating conditions resumed. However, a few days later I did plug in my code reader and saw the stored "P0420".

I've read about the ECM updates with the TSB, and front or rear catalytic converter replacements.

The major questions I have, all the threads mentioned the light and code, but no one mentioned if they experienced any engine issues prior/during with the light?

Does this scenario change anything? I read one other post on a different forum that mentioned a bad ignition coil.

Lastly, a few weeks ago at about 85,000 miles the SES light came on twice, both times my code reader just said "CHECK SERVICE BOOKS"? It didn't have any P code. I cleared it. The light came back on a day later, but my reader said "No active codes" - the "CHECK SERVICE BOOKS" code was stored. This was not accompanied by any problems. I reset the light again and it has been a couple weeks with no problems until now.

I apologize for the lengthy post, but I wanted to be thorough, and hopefully fill in the blanks for anyone else who has this problem in the future.

Any help, as always, is greatly appreciated.

Thanks,
Justin
 

·
Registered
Joined
·
44 Posts
Discussion Starter · #3 ·
Wouldn't a screw bouncing around in a cylinder make a big mess real fast?

And why would this cause the P0420 code?


Sorry I'm not at all familiar with the pathfinder engine ...
 

·
Registered
Joined
·
44 Posts
Discussion Starter · #5 ·
Is it worth putting in new plugs and wires first? Couldn't that lead to a misfire?
I'd rather knock out any easier regulat maintenanve items before tearing half the engine apart.

And could a coil still be a possibility?

Thanks
Justin
 

·
Registered
Joined
·
44 Posts
Discussion Starter · #7 ·
Thanks for the update, so I'm now armed with the following:

Misfires (during momentary loss of power) likely threw the Cat code.

Misfire could be caused by power valve screws in the cylinder or a bad coil.

Can anyone confirm or deny if they had engine performance troubles with the P0420 error, that was corrected by the ECM update? Or the ECM update simply fixes a bug with the SES Light itself (no real problems, just a software issue)?

I'm assuming ECM is just for the light, and never experiences actual rough idle or loss of power.

Finally - where do I start? How do you diagnose a coil or a screw in the cylinder, or could even be bad gas for all I know! More importantly, what do you check first?

Is there any preferred checklist of parts or items to check that lead to the blinking SES and loss of power? My code reader does show live data, is there anything I shoudl be looking for there to help diagnose?

Thanks,
Justin


Perhaps for now I'll let it go and see if it happens again anytime soon.
 

·
Registered
Joined
·
44 Posts
Discussion Starter · #9 ·
P1320 Code

Ok, now the SES light came on again, this time it came up with code P1320 - Ignition Failure.

I quick check seems to point to a bad ignition coil, which would support the misfire, which would explain the catalytic code and stammering that was experienced.

I read a few places that all 6 ignition coils should be replaced at once, they seem to run a little under $100/piece... Is it really nescessary? Is there anyway for an average DIY'er to test an ignition coil that is on its way out?

Thanks,
Justin
 
1 - 5 of 5 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top