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 BULLETINSCUSTOMER INTERESTFUEL SYSTEM - MIL ON/DTC P0171 SET
2004 Mitsubishi Lancer L4-2.0L SOHC
Fuel System - MIL ON/DTC P0171 Set
2004 Mitsubishi Lancer L4-2.0L SOHCSECTION Fuel System - MIL ON/DTC P0171 Set
No: TSB-06-13-009
DATE: April, 2006
MODEL:
2004-06 Lancer 2.0L
SUBJECT:
DTC P0171 SYSTEM TOO LEAN
PURPOSE
The MIL may come on and DTC P0171 "System Too Lean" may set in the PCM. This condition may be due to vacuum leakage around a fuel injector insulator. To eliminate this condition, install a new, improved 0-ring (listed in the PARTS INFORMATION section of this bulletin) on all fuel injectors. When installing the injectors, it is critical that there is no air leakage between the fuel injector and the insulator.
AFFECTED VEHICLES
2004-2006 Lancer models equipped with 2.0L engine
PROCEDURE
Replace the 0-ring and insulator on all fuel injectors, using the parts listed below.
Verify that there is no clearance between the insulator and the injector. Install the injectors on the fuel rail.
After the fuel rail is installed on the engine, be sure to press the injectors firmly down against the insulators.
PARTS INFORMATION
Use the Genuine Mitsubishi Part shown.
WARRANTY INFORMATION
DATE: April, 2006
MODEL:
2004-06 Lancer 2.0L
SUBJECT:
DTC P0171 SYSTEM TOO LEAN
PURPOSE
The MIL may come on and DTC P0171 "System Too Lean" may set in the PCM. This condition may be due to vacuum leakage around a fuel injector insulator. To eliminate this condition, install a new, improved 0-ring (listed in the PARTS INFORMATION section of this bulletin) on all fuel injectors. When installing the injectors, it is critical that there is no air leakage between the fuel injector and the insulator.
AFFECTED VEHICLES
2004-2006 Lancer models equipped with 2.0L engine
PROCEDURE
Replace the 0-ring and insulator on all fuel injectors, using the parts listed below.
Verify that there is no clearance between the insulator and the injector. Install the injectors on the fuel rail.
After the fuel rail is installed on the engine, be sure to press the injectors firmly down against the insulators.
PARTS INFORMATION
Use the Genuine Mitsubishi Part shown.
WARRANTY INFORMATION
RENDER: 1.0x
NO RELATED
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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.