Subaru Legacy BN/BS (2015-2019) Owners Manual: If the light illuminates constantly
If the light illuminates constantly while driving or does not turn off after the engine starts, an emission control system malfunction has been detected. You should have your vehicle checked by an authorized SUBARU dealer immediately. NOTE This light also illuminates when the fuel filler cap is not tightened until it clicks. If you have recently refueled your vehicle, the cause of the CHECK ENGINE warning light/malfunction indicator light coming on could be a loose or missing fuel filler cap. Remove the cap and retighten it until it clicks. Make sure nothing is interfering with the sealing of the cap. Tightening the cap will not make the CHECK ENGINE warning light/malfunction indicator light turn off immediately. It may take several driving trips. If the light does not turn off, take your vehicle to your authorized SUBARU dealer immediately. |
CHECK ENGINE warning light/Malfunction
indicator light
CAUTION
If the CHECK ENGINE warning light/
malfunction indicator light illuminates
while you are driving, have
your vehicle checked/repaired by
your SUBARU dealer as soon as
p ...
If the light is blinking
If the light is blinking while driving, an
engine misfire condition has been detected
which may damage the emission
control system.
To prevent serious damage to the emission
control system, you ...
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Dtc u0100 lost communication with ecm/pcm "a"
NOTE:Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. Basic Diagnostic Procedure1. OUTLINE OF DIAGNOSIS (ENGINE TYPE FB)• Detect malfunction of CAN communication.• Judge as NG when CAN communication failure occurs with the ECM.2. EXECUTION CONDITION (ENGINE TYPE ...
