Front or back?
lancer
Based on numerous internet searches the code means you check engine light is on.
It means there is a problem with the SRS (Supplemental Restraint System) or Air Bags. This is a repair for a professional.
In a 2004 Mitsubishi Lancer replacing the rear light bulb is relatively easy. First remove the plastic cover from the dome light. Unscrew the light bulb and insert the replacement.
Have the problem that triggered the light repaired by a professional. He will reset the light. Not a DIY repair.
You have light bulb that is burned out at the back of the vehicle.
Retract means to take something back, or to disavow it. It also means to draw back. So logically to retract light would mean to draw back the light source, as you cannot physically draw back or tack back light itself once it has been released.
See sources and related links below for the 2002 Mitsubishi Lancer headlight bulb info.
The oil sending unit is located on the back side of the engine on a 2002 Lancer. It is under the intake manifold.
You will need special brake caliper tool such as a C-clamp to push back the piston on the caliper of a 2002 Mitsubishi Lancer.
Grand Touring Sport