[535_BiTurbo]

F10 550;
Yesterday I changed out my tires from Pirelli 295/30-20 to MT Street drag radials 275/40-20 and once I started driving, my dash lit up like a christmas tree. Chassis Stabilization, Transmission Malfunction, Drivetrain malfunction, the ABS and Brake lights are on and a check engine light came on.
Connected an OBD II Scanner and Im throwing a Check engine light; P15c9. Ive tried restarting the car several times and check engine light still comes up. Car runs fine and makes power. all the lights went away except check eng

What the heck is P15C9?

[Stück]

You need to put the correct size tires back on the car and that will probably go away.

6.3% Diameter difference is not acceptable, 27" vs 28.7" is WAY OFF.

[535_BiTurbo]

Originally Posted by Stück

You need to put the correct size tires back on the car and that will probably go away.

6.3% Diameter difference is not acceptable, 27" vs 28.7" is WAY OFF.

The freaking tire size causes a check engine light 😮

[535_BiTurbo]

It's the tires thats causing the Check eng light, I disconnected battery and as long I drive with traction control off and in comfort mode it drives fine.
Ive ordered some 305/30-20 tires, waiting for them to get here.