joewood

Hello all, 2003 Sl55 40k miles.
Started engine yesterday, low coolant light comes on and goes off, check engine light come on and stays on. It idled fine, but when I try to accelerate engine revs extremely slow as if it has no power. I tried adding coolant, it took about a 1/4 of a gallon to fill. I still have the same results check engine light is still on and power is very low.

Does anyone know what the problem might be?
Thanks Joe

desired_speeds

Scan for the code first.

carguyshu

could be lots of things. Could be a headgasket went bad (rare) and is dumping coolant into the engine causing to to perform bad as well as run low on coolant. Could be when the coolant ran low the car is now not letting the supercharger engage. Either way you need to find out why you are low on coolant and as desired speeds said get the codes read for the check engine light.

joewood

Thanks Guys, I pulled the codes today, the code I have is P0122. So what should I do next?

DUDMD

Take it into a shop that can properly diagnose this. Could be a bad throttle body/pedal sensor/etc.
That would certainly cause limp mode and power loss. A proper diagnosis should help to find your issue.

Ingenere

P0122 is a throttle pedal position sensor.