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.
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HOMESERVICE MANUALSMITSUBISHI2004LANCER L4-2.0L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINS
2004 Mitsubishi Lancer L4-2.0L SOHC
Computers and Control Systems: Technical Service Bulletins
2004 Mitsubishi Lancer L4-2.0L SOHCSECTION Technical Service Bulletins
- Recalls
- Customer Interest
- By Symptom
- All Technical Service Bulletins
- Engine Controls - Revised Misfire DTC Information
- Powertrain, Antitheft - ECU & PCM Replacement
- Powertrain - DTC P0172 & P0175
- Powertrain - Freeze Frame Data & MFI Related DTC's
- Engine Controls - Hard/No Start/DTC P0335 or P0340 Set
- Engine Controls - False MIL ON/DTC's P0335/P0340
- Fuel System - MIL ON/DTC P0171 Set
- Recall - PCM Update for Warm-Up Cat. Converter Melt Down
- Engine Controls - Freeze Frame Data For DTC's
- Fuel System - DTC P0181 Update
- Engine Controls - DTC P0441
- Engine Controls - DTC P0335/P0340
- Fuel System - EVAP DTC's & Check Engine Light
- Fuel System - MIL ON with DTC P0171/174
- Engine Controls/Emissions - OBDII Drive Cycle Revisions
- Fuel/Emissions - Loose Gas Cap/MIL ON
- Engine Controls - ECM Programming Precaution
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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.