Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2000 Mercedes Benz S500FACTORY OEM SERVICE PROCEDURE
DTC Description
- Fault Memory & Actuation Of MIL - After 2 consecutive driving cycles with fault.
- Frequency Of Testing - Continuous.
- Checked Signal Or Status - Calculated resistance value of sensor heater.
- Lower Limit Value - Less than 2 ohms. Corresponds to approximately 6 amps at 12 volts.
- Upper Limit Value - More than 10 ohms. Corresponds to approximately 6 amps at 12 volts.
- Test Conditions - Engine running and sensor heater on and heating-up time of approximately 220 seconds has elapsed.
NOTE:
Fault in O2 sensor heating is also set if cycle duration of O2 sensor signals within a driving cycle suddenly increases to more than 25 seconds.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.