engine codes question

[wheelife]

Hi all

My 99 c280s check engine light came on today.
I scanned the codes and retrieved a code # 173
The car seems to be running OK.

Any ideas ?

thanks

[CKlasse]

I have to look it up..but here is the general format of OBDII codes.

They are usually 5 alphanumeric codes.

First one is always one of the following:
B = Body
C = Chassis
P = Powertrain
U = Network

Second is a numeric of 0 (zero) or 1 (one)...
0- SAE (standard)
1- manufacturer (additional code put in by perticular manufacturer)

Third is the most imporant digit.. 1-8
1- Fuel and Air Metering
2- Fuel and Air Metering (in fuel injection system only)
3- Ignition
4- Aux emission control
5- Idle control/ aux inputs
6- Computer/aux output
7- transmission
8- transmission

The last two digits always come together.... These digits are the pintpoint code. It tells what exactly is wrong.

In your case.. the full code would be P0173 - We know its fuel/air system. The 73 part, I have to look it up.