SL/R230: OBDII code PO300
Thread Starter
Newbie
Joined: Feb 2011
Posts: 2
Likes: 0
From: Turlock CA
SL600
OBDII code PO300
I'm looking for info on PO300 which is random cylinder misfire. I also show 301, 302, 303, 307, 308, and 309. The dealer just installed new plugs, motor mounts, air cleaners and I tuned it to 600 hp. Any ideas what might be causing these codes before I take it the dealer. Car is 2004 SL600 with 58K miles. It runs rough only once and a while it is not constant.
Member
Joined: Dec 2010
Posts: 126
Likes: 0
From: OKC, OK.
2014 SL550
I'm looking for info on PO300 which is random cylinder misfire. I also show 301, 302, 303, 307, 308, and 309. The dealer just installed new plugs, motor mounts, air cleaners and I tuned it to 600 hp. Any ideas what might be causing these codes before I take it the dealer. Car is 2004 SL600 with 58K miles. It runs rough only once and a while it is not constant.
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
Thread Starter
Newbie
Joined: Feb 2011
Posts: 2
Likes: 0
From: Turlock CA
SL600
Thanks, I've learned those details since this started. The dealer found that both ignition coils were putting out less than required voltage so they have replaced them. ($3300.00)I'll pick it up tomorrow and see how it does.
