It is possible you've been unable to complete the Secondary Air Injection monitor because you have not initiated a drive cycle from a Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 122°F and within 11°F of the ambient air temperature. Follow the Mercedes Benz C230 Drive Cycle below to complete all monitors, including the Secondary Air Injection Monitor. If you have a scan tool, check the Air Injection Monitor after completing the requires Air Injection Drive Cycle step (Step 1). If all monitors show COMPLETE or READY, there will be no need to continue the rest of the drive cycle. Take extreme caution when performing drive cycles on public roadways. Perform the procedure at your own risk.
How to Complete Mercedes Benz C230 Drive Cycle
Note: The drive cycle needs to be done two (2) consecutive times. Prior to driving your Mercedes Benz C230 read the drive cycle test instructions carefully and completely to ensure successful drive cycle success. Ensure your Mercedes has at least 1/4 to 3/4 tank of gas. An empty or full gas tank will not allow the EVAP monitor to run. Also begin the drive cycle from a cold start; best achieved by leaving your vehicle sitting overnight. The drive cycle will not run if the check engine light is on or illuminated.
1. Secondary Air Injection Monitor
- From a cold start, start engine and while the vehicle is in Park, accelerate engine speed to 1400 rpm. Ensure A/C system is off and the engine has no load (all lighting, radio, and defroster should be off).
- Allow engine temperature to reach 158°F-200°F. This temperature range should be achieved when your MBZ's temp gauge shows near the middle (normal operating temp).
- Maintain 1400 RPMs for 7 minutes.
- Return engine speed to idle (off throttle) for 6 seconds.
- Turn the ignition OFF.
- Wait ten seconds and repeat this step.
- Continue to Step 2.
2. 02 Sensor Heater Monitor
- Start engine and with transmission in Park and no load applied, increase engine speed to between 2,000 to 2,500 RPM and maintain this RPM for 2 minutes. Keep RPM steady at which ever range you've chosen (between 2,000 and 2,500).
- After 2 minutes, reduce engine speed to idle and run engine with no load applied for 6 minutes.
- Continue to Step 3.
3. Oxygen Sensor Monitor
- Begin driving. Accelerate to 43 mph (70 km/h) and hold speed for 3 minutes.
- Continue to Step 4.
4. Catalyst Monitor
- Increase speed to between 48-54 mph (80-90 km/h) and continue driving for 3 minutes.
- Bring the vehicle to a stop and place transmission in Park.
- Idle engine with no load for 3 minutes.
- Continue to Step 5.
5. EGR Monitor
- Place vehicle in Drive and (D position) and accelerate smoothly up to 2000 rpm. Monitoring MPH at this point is not necessary. It is only necessary that you maintain required engine RPMs while your Mercedes is moving. After engine speed reaches 2000 rpms, decelerate smoothly back down to 1100 rpm.
- Stop vehicle. Place transmission in Park. Wait 10 seconds and repeat this step.
- Continue to Step 6.
6. Fuel System EVAP Monitor
- Ensure the fuel tank level is between 1/4 and 3/4 full.
- Ensure engine temperature less than 212°F.
- With the transmission in Park position, start and idle engine for 20 minutes. Ensure there is no load. A/C, radio, lighting, and defroster must be off.
- After 20 minutes, turn engine and ignition OFF.
- Wait 10 seconds and repeat this step.
7. Drive Cycle End
- Perform Steps 1 through 6 again.
If all other emissions systems are functioning properly, completing the drive cycle above should set or make ready (complete) your Mercedes Benz C230 emission monitors. If the emission monitors are still not complete then check for any trouble codes and whether the check engine light is on or not. If faults are found make the appropriate repairs and conduct the drive cycle again.