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2009 Subaru Forester X 4dr Man

2009 Subaru Forester
Trim Info:
All Wheel Drive, 4 Door, 4WD Sport Utility
20 mpg city / 26 mpg hwy
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February 5, 2011, 7:13 am

Diane M
 

Question: Subaru check engine light

Bought 1998 Subaru Forester with check engine light on 8 months ago for 1st car 17yr old son. Drove well. Had engine analysis done. Showed po106,po117,po302,po303,po304,po420. Mechanic said would take thousands to fix but did not drive car.With all these codes, would the car drive as well as it does? Want to fix but not spend a fortune. Does this car have injectors? How much if needed would it cost to replace?


February 10, 2011, 8:55 pm

Elizabeth K
Expert Mechanic

P0106 - MAP/Barometric Pressure Circuit Range/Performance Problem
P0117 - ECT Circuit Malfunction
P0302 Code - Cylinder #2 Misfire
P0303 Code - Cylinder #3 Misfire
P0304 Code - Cylinder #4 Misfire
P0420 Catalyst System Efficiency Below Threshold (Bank 1)

I would not condemn this car. First, test the MAP sensor, ECT sensor, o2 sensors, and ignition coils/spark plugs. If after testing, none of these are faulty, then it looks like your ECM (on board computer) and/or the catalytic converter could be the problem, and that is probably several hundred dollars each. Did the mechanic say why it would be so expensive? If he's not a trusted mechanic, get another opinion. I think that it is worth diagnosing the issue a little further before making a decision.

Yes, the car has injectors. To get a repair estimate, use the 'repair cost calculator' link on this site.

Yes, the car could drive well with all those codes set. When sensors are out of parameters, the car goes to pre-set mixtures enabling it to run without it's feedback system working. It will run, but not at high efficiency (mileage) or performance.


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