p0304 Code - 997.2
#1
p0304 Code - 997.2
I took my 911 in for emissions, and got the "monitors not ready" error... assumed it might have been if the shop has disconnected the battery during a recent springs install and wheel bearing replacement.
After driving it around for a couple of days to get the monitors ready, I got a check engine light. After restarting the car, I checked it with the OBD reader and saw the P0304 code.
Any thoughts on what this means? It may be my imagination, but I think the car was also running a bit rough around the time this happened.
thanks!
After driving it around for a couple of days to get the monitors ready, I got a check engine light. After restarting the car, I checked it with the OBD reader and saw the P0304 code.
Any thoughts on what this means? It may be my imagination, but I think the car was also running a bit rough around the time this happened.
thanks!
#4
RL Community Team
Rennlist Member
Rennlist Member
How many miles on the car and how long since plugs and coil packs have been replaced? If more than 30,000 miles that's probably what you need and you might as well do all of them as it will just be a matter of time before the others go bad and do the same thing once one fails. The other thing that can cause a misfire in only one cylinder is low compression, but that's unlikely and it's probably just the plug or coil pack.
#6
RL Community Team
Rennlist Member
Rennlist Member
If the battery was disconnected for a while, then the computer has to reset itself.... someone here knows the official words for this process.... something about readiness or whatever..... It takes some elongated driving time before the car knows itself.
Check out #28 here... this is for the 996 but I am sure the issue is the same for all of our cars.... process may be different... do some more research: https://rennlist.com/forums/996-foru...t-ready-2.html
Peace
Bruce in Philly
Check out #28 here... this is for the 996 but I am sure the issue is the same for all of our cars.... process may be different... do some more research: https://rennlist.com/forums/996-foru...t-ready-2.html
Peace
Bruce in Philly
#7
Update on this- looks like it was indeed a cracked coil. I went ahead and had all of them changed as they were reported to be due, drove around for awhile and saw no pending codes. And passed my past-due emissions
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#8
RL Community Team
Rennlist Member
Rennlist Member
Good deal. I assume you did new plugs at the same times so you should be good for a while.
#9
Rennlist Member
I was just at the P dealer yesterday and the SA suggested replacing the coil packs when you do the plugs on a 997.2. I know the 997.1 have a propensity to crack but didn’t think it was an issue on the .2. Mine looked fine when I replaced my plugs so I left them. I figure I will do them when I get a misfire code or are guys replacing them preventatively at a certain time or mileage?
#10
RL Community Team
Rennlist Member
Rennlist Member
I was just at the P dealer yesterday and the SA suggested replacing the coil packs when you do the plugs on a 997.2. I know the 997.1 have a propensity to crack but didn’t think it was an issue on the .2. Mine looked fine when I replaced my plugs so I left them. I figure I will do them when I get a misfire code or are guys replacing them preventatively at a certain time or mileage?
#11
RL Community Team
Rennlist Member
Rennlist Member
I was just at the P dealer yesterday and the SA suggested replacing the coil packs when you do the plugs on a 997.2. I know the 997.1 have a propensity to crack but didn’t think it was an issue on the .2. Mine looked fine when I replaced my plugs so I left them. I figure I will do them when I get a misfire code or are guys replacing them preventatively at a certain time or mileage?
Peace
Bruce in Philly
#12
Rennlist Member
The new style coil packs with the thicker insulator back section (require longer screws when upgrading from the old 997.1 style) are supposed to last longer before cracking and the reason for the update. I'd leave them alone until you get misfires. They'll show up first when driving in the rain.