Service Program WQW-58 (Engine Control Module Reprogramming)

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Subaru has developed a modification to the Engine Control Module (ECM) software logic due to a possible pre-ignition issue on certain 2015 model year WRX vehicles and certain 2014 and 2015 model year 2.0XT Forester vehicles, equipped with a 2.0 liter turbocharged engine.

Under certain high engine load driving conditions, engine combustion may occur prior to spark ignition resulting in elevated cylinder temperatures and pressures. This could cause a rough idle and engine noise, and if left unaddressed it could lead to excessive erosion of the spark plugs and possible engine damage.

FAQs

Q: What will be done to the vehicle?
A: Subaru will inspect your vehicle and reprogram the ECM. If any related spark plug or engine damage is detected during the inspection, your vehicle will be repaired.

Q: What should I do?

A: You should immediately contact your Subaru retailer (dealer) for an appointment to have this repair performed.


Q: Is this a safety-related issue?
A: No. This is not a safety-related issue.


Q: Will this affect any components in the vehicle?
A: No. This update will not affect the performance or integrity of any components in your vehicle.

Q: Will this affect the vehicle.s fuel economy?
A: No. This update will not affect your fuel economy.

Q: How much will this update cost?
A: The repair will be performed at no cost to you.

Q: Do I need to make an appointment?
A: Yes. Please contact your servicing Subaru retailer to set up an appointment to ensure that the dealer is able to perform your update in a timely fashion.

Q: How much time should I allot to have this update performed?
A: The time to perform the inspection and reprogramming is approximately three hours. However, it may be necessary to leave your vehicle for a longer period of time on the day of your scheduled appointment to allow your Subaru retailer flexibility in scheduling, or for repair.

Q: Do I have to return to the dealer where I bought the car?
A: No. Any authorized Subaru retailer will be able to perform this update free of charge for you.

Q: Who can I contact if I have more questions?
A: To locate the nearest Subaru retailer you can access our website at www.subaru.com and select .Find a Retailer.. If you need additional assistance, please contact us directly: