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Tom, ASE Certified Technician
Category: Car
Satisfied Customers: 25927
Experience:  ASE Certified Master Technician
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What will be the indicators of it not running well due to ECM

Customer Question

What will be the indicators of it not running well due to ECM malfunction?
Submitted: 4 years ago.
Category: Car
Expert:  Tom replied 4 years ago.
What year and model is your vehicle ?
Customer: replied 4 years ago.
Mr Subaru Expert,
My Legacy 1999 is the 30th anniversary model.
Fully loaded except for moon roof.
Thank you.
Expert:  Tom replied 4 years ago.
Ok what is actually going on with the vehicle ?
Customer: replied 4 years ago.
The check engine light comes on after driving the car for approx 6-8
mile (heat induced).
The car continues to run with no obvious problems. No noise nor
slow-down on tachometer.
So my concern is: if the ECM is "bad" as suggested by the Subaru dealer;
he checked it out, but i don't notice any difference in engine
performance, what can i expect if i continue to run the car without
replacing the $800+ ECM? The mileage is 241,000..
Thank you.

Expert:  Tom replied 4 years ago.
You should be fine unless the ECM fails completely . To be honest if the ECM is bad the vehicle will usually run poorly . So if there are no running issues then you should be ok it will start to run rough before it fails. Also if there is a code stored for the engine light that would tell you what the cause is. Last you can get the ECM from eBay to save a lot of money and have it programmed at the dealer if necessary . These are the next steps. Hoped this helped . Bonuses greatly appreciated. Please click excellent service so I get credit for my help thanks . Anything lower is negative feedback . If you need further assistance please let me know thanks !

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