Check engine light S500 how to check codes
 

the check engine light just came on our 94 S500 how do check the codes given by the check engine light?

DTC codes
 

can be checked with the LED/SW combo next to the F23 module box on the passenger side of the engine compartment.

Read the details on my web page by clicking the link (www) below. If you need any other help, please let me know.

The Diag Module (Menu #5) contains info on the codes that light the Check Engine light. Take you time and read through the menu items to get a 'feel' for the complex engine systems.

To read all codes in the other modules, you'll need a scanner.

thanks outstanding page very imformative i am getting the following codes but engine is running perfect no problems good idle no misfiring here are the codes #5,6,8,9,18 i check every vacum hose and plug and they seen tight and clean. How do I reset the light? last week i was working on a fuel
problem i installed a new fuel PS regulator and i ran the motor without the air filter could that be a problem? car cranks good hot or cold under 4 seconds :(

. . . lots of DTCs!
 

DTCs:
5 Exhaust gas recirculation inoperative
6 Idle speed control inoperative
8 Engine coolant temperature sensor, open/short
9 Intake air temperature sensor, open/short
18 Adjustable camshaft timing solenoid, open/short circuit

Well, hard to say what all those codes mean other than maybe 5 and 9 are due to you banging around under the hood! Did the same thing last time; forgot to reconnect the IAT sensor.

DTC 8 is a major player in that if it is really bad, that would probably make the car run very badly!

To reset the codes: use the X21sw combo (LED/SW). The procedure is to bring the code up, then within 20secs, press the sw for 9 secs. This resets that particular code. Do this procedure for each DTC.