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.
2003 Mercedes Benz SLK320 StandardFACTORY OEM SERVICE PROCEDURE
Engine Performance DTCS
ENGINE PERFORMANCE DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Possible cause | |
| STAR DIAGNOSIS | (Display on generic scan tool) | |
| P2001 | (P0400) | Exhaust gas recirculation malfunction (function chain), ME-SFI fault code description |
| P2003 | (P0410) | Air injection malfunction (function chain), MESFI fault code description |
| P2004 | (P0100) | Hot-film MAF sensor, ME-SFI fault code description |
| P2005 | (P0115) | Coolant temperature sensor, ME-SFI fault code description |
| P2006 | (P0110) | Intake air temperature sensor, ME-SFI fault code description |
| P2007 | (P0105) | Pressure sensor, ME-SFI fault code description |
| P2008 | (P0135) | O2S-sensor heater, (Right O2 sensor upstream TWC [KAT], internal resistor) ME-SFI fault code description |
| P2009 | (P0141) | O2S-sensor heater, (Right O2 sensor downstream TWC [KAT], internal resistor) ME-SFI fault code description |
| P200A | (-) | Anti-knock control in hardware fault control unit, ME-SFI fault code description |
| P200B | (P0422) | Fault code description - Right catalytic converter efficiency too low |
| P200C | (-) | Aging of O2 sensor downstream TWC, ME-SFI fault code description |
| P200D | (P0133) | Aging of O2 sensor downstream TWC, ME-SFI fault code description |
| P200E | (-) | O2 Sensor signal, ME-SFI fault code description |
| P200F | (P0130) |
O2 Sensor signal, ME-SFI fault code description |
| P2010 | (P0136) | O2 Sensor signal, ME-SFI fault code description |
| P2011 | (-) | Right knock sensor 1, ME-SFI fault code description |
| P2012 | (P0446) | Activated charcoal canister shut-off valve, MESFI fault code description |
| P2013 | (P0455) | Major Regeneration system leak (function chain) ME-SFI fault code description |
| P2014 | (P0422) | Minor Regeneration system leak (function chain) ME-SFI fault code description |
| P2015 | (P0440) | Regeneration system leak (function chain) ME-SFI fault code description |
| P2016 | (P0170) | Self-adaptation of mixture formation at limit, ME-SFI fault code description (For the right cylinder bank, at partial load) |
| P2017 | (P0170) | Self-adaptation of mixture formation at limit, ME-SFI fault code description (For the right cylinder bank, in idle) |
| P2018 | (P0170) | Self-adaptation of mixture formation at limit, ME-SFI fault code description (For the right cylinder bank, between idle and partial load) |
| P2019 | (P0170) | Coolant antiboil protection, ME-SFI fault code description |
| P201A | (P0341) | Camshaft Hall sensor, ME-SFI fault code description |
| P201B | (P0560) | Control unit voltage supply, ME-SFI fault code description |
| P201C | (P0450) | Tank pressure sensor, ME-SFI fault code description |
| P201D | (P0201) | Fuel injection valves, Cylinder 1, ME-SFI fault code description |
| P201E | (P0204) | Fuel injection valves, Cylinder 4, ME-SFI fault code description |
| P201F | (P0203) | Fuel injection valves, Cylinder 3, ME-SFI fault code description |
| P2020 | (P0206) | Fuel injection valves, Cylinder 6, ME-SFI fault code description |
| P2021 | (P0202) | Fuel injection valves, Cylinder 2, ME-SFI fault code description |
| P2022 | (P0205) | Fuel injection valves, Cylinder 5, ME-SFI fault code description |
| P2023 | (P0410) | Air injection relay, ME-SFI fault code description |
| P2024 | (P0412) | Air pump switchover valve, ME-SFI fault code description |
| P2025 | (P0446) | Activated charcoal canister shut-off valve, MESFI fault code description |
| P2026 | (P0443) | Purge control valve, ME-SFI fault code description |
| P2027 | (P0403) | EGR [ARF] pressure transducer, ME-SFI fault code description |
| P202B | (P0507) | Idle speed control, ME-SFI fault code description |
| P202C | (P0115) | Coolant thermostat, ME-SFI fault code description |
| P202D | (P0115) | Coolant temperature sensor, ME-SFI fault code description |
| P202E | (P0120) | Throttle valve actuator, ME-SFI fault code description (Adjustment) |
| P202F | (P0600) | CAN fault detection, ME-SFI - fault code description (CAN message from ABC control unit) |
| P2030 | (P0600) | CAN fault detection, ME-SFI fault code description (CAN message from electronic selector lever module control unit) |
| P2031 | (P0600) | CAN fault detection, ME-SFI fault code description (CAN message from steering column module) |
| P2032 | (P0120) | Throttle valve actuator, ME-SFI fault code description (Actual value potentiometer) |
| P2033 | (-) | Cruise control switch, ME-SFI fault code description |
| P2034 | (P0335) | Crankshaft position sensor, ME-SFI fault code description |
| P2036 | (P0600) | CAN fault detection, ME-SFI fault code description (CAN message from ESP control unit) |
| P2037 | (P0600) | CAN fault detection, ME-SFI fault code description (CAN message from ETC control unit (Transmision 722.6)) |
| P2038 | (-) | Left knock sensor 2, ME-SFI fault code description |
| P2039 | (-) | Oil sensor, ME-SFI fault code description (Oil level implausible) |
| P203A | (P0460) | Fuel tank fill level, ME-SFI fault code description |
| P203B | (P0221) | ME-SFI control unit, ME-SFI fault code description (Fault in function monitoring) |
| P203C | (P0221) | ME-SFI control unit, ME-SFI fault code description (Fault in function monitoring) |
| P203E | (P0600) | CAN fault detection, ME-SFI fault code description (CAN message from instrument cluster) |
| P2040 | (-) | Oil sensor, ME-SFI fault code description (Oil quality implausible) |
| P2041 | (-) | Oil sensor, ME-SFI fault code description (Water in engine oil) |
| P2042 | (-) | Safety fuel shutoff detected, ME-SFI fault code description |
| P2043 | (P0300) | Misfire, ME-SFI fault code description (Sum, emission limit) |
| P2044 | (P0301) | Misfire, ME-SFI fault code description (M1MM is firing at cylinder 1, emission limit) |
| P2045 | (P0304) | Misfire, ME-SFI fault code description (Misfiring at cylinder 4, emission limit) |
| P2046 | (P0303) | Misfire, ME-SFI fault code description (Misfiring at cylinder 3, emission limit |
| P2047 | (P0306) | Misfire, ME-SFI fault code description (Misfiring at cylinder 6, emission limit |
| P2048 | (P0302) | Misfire, ME-SFI fault code description (Misfiring at cylinder 2, emission limit |
| P2049 | (P0305) | Misfire, ME-SFI fault code description (Misfiring at cylinder 5, emission limit |
| P2050 | (P0300) | Misfire, ME-SFI fault code description (Sum, TWC-damaging) |
| P2051 | (P0301) | Misfire, ME-SFI fault code description (Misfiring at cylinder 1, TWC-damaging) |
| P2052 | (P0304) | Misfire, ME-SFI fault code description (Misfiring at cylinder 4, TWC-damaging) |
| P2053 | (P0303) | Misfire, ME-SFI fault code description (Misfiring at cylinder 3, TWC-damaging) |
| P2054 | (P0306) | Misfire, ME-SFI fault code description (Misfiring at cylinder 6, TWC-damaging) |
| P2055 | (P0302) | Misfire, ME-SFI fault code description (Misfiring at cylinder 2, TWC-damaging) |
| P2056 | (P0305) | Misfire, ME-SFI fault code description (Misfiring at cylinder 5, TWC-damaging) |
| P205E | (P0702) | ETC control unit, ME-SFI fault code description (Internal fault, Transmission 722.6) |
| P205F | (P0753) | 1-2/4-5 shift solenoid valve, ME-SFI fault code description |
| P2060 | (P0758) | 2-3 shift solenoid valve, ME-SFI fault code description |
| P2061 | (P0763) | 3-4 shift solenoid valve, ME-SFI fault code description |
| P2062 | (P0743) | PWM torque converter lockup solenoid valve, ME-SFI fault code description |
| P2063 | (P0748) | Modulating pressure control solenoid valve, ME-SFI fault code description |
| P2064 | (P0748) | Shift pressure control solenoid valve, ME-SFI fault code description |
| P2065 | (P0702) | Supply voltage to valves, ME-SFI fault code description |
| P2066 | (P0715) | Supply voltage and speed sensors function, ME-SFI fault code description |
| P2067 | (P0705) | ETC control unit, ME-SFI fault code description (Selector lever module incorrectly coded) |
| P2068 | (P0720) | ETC control unit, ME-SFI fault code description (CAN message from the rear wheels from ESP control unit missing or incorrect) |
| P2069 | (P0700) | Gear implausible or leak in transmission, ME-SFI fault code description |
| P206A | (P0700) | Command valve jams in pressure position, MESFI fault code description |
| P206B | (P0740) | Torque converter lock-up clutch, ME-SFI fault code description |
| P206D | (P0730) | Gear comparison (many times) negative, MESFI fault code description |
| P206E | (-) | Transmission variant implausible, ME-SFI fault code description (Coded for manual transmission, vehicle has automatic transmission) |
| P206F | (-) | Transmission variant implausible, ME-SFI fault code description (Incorrectly coded or fault in CAN communication with ETC control unit) |
| P2070 | (-) | Transmission variant implausible, ME-SFI fault code description |
| P2072 | (P0450) | Tank pressure sensor, ME-SFI fault code description (Plausibility) |
| P2073 | (-) | Electrical suction fan, ME-SFI fault code description |
| P2074 | (-) | Variable intake manifold switchover valve, ME-SFI fault code description |
| P2075 | (P0442) | Regeneration system minor leak (function chain) ME-SFI fault code description |
| P2076 | (-) | Oil sensor, ME-SFI fault code description (Oil temperature implausible) |
| P2079 | (-) | CAN fault detection, ME-SFI fault code description (VGB speed) |
| P207A | (-) | CAN fault detection, ME-SFI fault code description (VGB speed) |
| P207B | (-) | CAN fault detection, ME-SFI fault code description (Selector lever position) |
| P207D | (-) | EIS control unit, ME-SFI fault code description |
| P207E | (P0432) | Left Catalytic converter efficiency too low, ME-SFI fault code description |
| P207F | (-) | Aging of O2 sensor downstream TWC, ME-SFI fault code description (Left O2 sensor upstream TWC [KAT], correction variable exceeded) |
| P2080 | (P0153) | Aging of O2 sensor downstream TWC, ME-SFI fault code description (Left O2 sensor upstream TWC [KAT], period duration) |
| P2081 | (-) | O2 Sensor signal - ME-SFI fault code description (Left O2 sensor downstream TWC [KAT], no sensor status change) |
| P2082 | (P0150) | O2 Sensor signal, ME-SFI fault code description (Left O2 sensor upstream TWC [KAT], electrical fault) |
| P2083 | (P0156) | O2 Sensor signal, ME-SFI fault code description (Left O2 sensor downstream TWC [KAT], electrical fault) |
| P2085 | (P0173) | Self-adaptation of mixture formation at limit, ME-SFI fault code description (For the left cylinder bank, at partial load) |
| P2086 | (P0173) | Self-adaptation of mixture formation at limit, ME-SFI fault code description (For the left cylinder bank, in idle) |
| P2087 | (P0173) | Self-adaptation of mixture formation at limit, ME-SFI fault code description (For the left cylinder bank, between idle and partial load) |
| P2088 | (P0155) | O2S-sensor heater, ME-SFI fault code description (Left O2 sensor upstream TWC [KAT], internal resistor) |
| P2089 | (P0161) | O2S-sensor heater, ME-SFI fault code description (Left O2 sensor downstream TWC [KAT], internal resistor) |
| P2090 | (-) | O2 sensor connectors swapped, ME-SFI fault code description |
| P2097 | (-) | Throttle valve actuator, ME-SFI fault code description (Throttle valve jamming, iced up) |
| P2098 | (-) | Crash signal implausible, ME-SFI fault code description |
| P20BE | (P0135) | O2S-sensor heater, ME-SFI fault code description (Right O2 sensor upstream TWC [KAT], voltage supply) |
| P20BF | (P0135) | O2S-sensor heater, ME-SFI fault code description (Left O2 sensor upstream TWC [KAT], voltage supply) |
| P20C2 | (P0141) | O2S-sensor heater, ME-SFI fault code description (Right O2 sensor downstream TWC [KAT], voltage supply) |
| P20C3 | (P0141) | O2-sensor heater, ME-SFI fault code description (Left O2 sensor downstream TWC [KAT], voltage supply) |
| P20Ca | (P0500) | CAN fault detection, ME-SFI fault code description (Speed signal of left rear wheel from ESP control unit) |
| P20Cb | (P0500) | CAN fault detection, ME-SFI fault code description (Speed signal of left front wheel from ESP control unit) |
| P20CC | (-) | CAN fault detection, ME-SFI fault code description (CAN message from the ESP control unit is missing or incorrect) |
| P20CD | (-) | Air conditioning (AC) system, ME-SFI fault code description (AC compressor torque implausible) |
| P20CE | (-) | Air conditioning (AC) system, ME-SFI fault code description (Refrigerant pressure in air conditioning too high) |
| P20CF | (P0120) | Fault code description for pedal value sensor, ME-SFI, Voltage difference between signal 1 and signal 2 |
| P20D0 | (-) | Air conditioning (AC) system, ME-SFI fault code description (Air conditioning requests an implausible fan output) |
| P20D1 | (-) | CAN fault detection, ME-SFI fault code description (Torque request from DTR control unit implausible) |
| P20D2 | (-) | CAN fault detection, ME-SFI fault code description (CAN transmission error of torque request from DTR control unit) |
| P20D3 | (-) | CAN fault detection, ME-SFI fault code description (CAN transmission error of torque request from DTR control unit) |
| P20D4 | (-) | Active load limitation, ME-SFI fault code description |
| P20D5 | (P0702) | ETC control unit, ME-SFI fault code description (The torque request from the ETC control unit is implausible) |
| P20D6 | (P0702) | ETC control unit, ME-SFI fault code description (CAN transmission error for torque request from ETC control unit) |
| P20D7 | (P0702) | ETC control unit, ME-SFI fault code description (CAN transmission error for torque request from ETC control unit) |
| P20D8 | (-) | ESP control unit, ME-SFI fault code description (ESP fault) |
| P20D9 | (-) | CAN fault detection, ME-SFI fault code description (Torque request from ESP control unit implausible) |
| P20Da | (-) | CAN fault detection, ME-SFI fault code description (CAN transmission error of torque request from ESP control unit) |
| P20Db | (-) | CAN fault detection, ME-SFI fault code description (CAN transmission error of torque request from ESP control unit) |
| P20DC | (P0120) | Fault code description for pedal value sensor, ME-SFI (Interruption at signal path 1) |
| P20DD | (P0120) | Pedal value sensor, ME- fault code description (Short-circuit at signal path 1) |
| P20DE | (P0120) | Pedal value sensor, ME-SFI fault code description (Interruption at signal path 2) |
| P20DF | (P0120) | Pedal value sensor, ME-SFI fault code description (Short-circuit at signal path 2) |
| P20E3 | (P0120) | Pedal value sensor, ME-SFI fault code description (Voltage supply for pedal value sensor) |
| P20E4 | (-) | CAN fault detection, ME-SFI fault code description (Implausible signal from the stop lamp switch) |
| P20E5 | (-) | CAN fault detection, ME-SFI fault code description (CAN transmission error of signal from stop lamp switch) |
| P20E6 | (-) | CAN fault detection, ME-SFI fault code description (CAN transmission error of signal from stop lamp switch) |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.