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Check engine light
12-02-2008, 03:40 PM
Post: #1
Check engine light
2006 Subaru Outback Wagon, 2.5L 4 cylinder with auto trans

Check Engine light is on. Cruise light is flashing and the cruise will not work. I disconnected the batter to clear the computer, but the light came back on about 3 miles down the road.

I hate going to a car repair shop and finding out its some stupid sensor to replace, which I can do myself. Any ideas? If I were to buy a diagnostic device for this car, what should I expect to spend and what do I want to buy.

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12-02-2008, 08:21 PM (This post was last modified: 12-02-2008 08:21 PM by way2old.)
Post: #2
RE: Check engine light
Go to your local Autozone, Pep Boys or other large parts chain. Most of them will read the codes for free in hopes of selling you something. You need to research what they tell you before you buy. You will need the EXACT code number for much help. They want to give you the sensor name and try to sell you that. Good luck.

Being way2old is why I need help from younger minds.

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12-03-2008, 07:51 PM
Post: #3
RE: Check engine light
They gave me the code number, and its for a $170 sensor, but it says it could be other things too. It seems a bit risky for me to buy a sensor and not be sure of the exact cause.

The error code is P0131
It says " The PCM has determined that the input voltage from oxygen sensor 1 in bank 1 is too low for current operating conditions. (Oxygensensor 1 is closest to the cylinder head before the catalytic converter, while oxygen sensors 2&3 are located further downstream and are typically mounte din or after the catalytic converter) ( Bank 1 identifies the locationi of cylinger #1, while bank 2 identifies the cylinders on the opposite bank

H02S-11 low voltage (heated Oxygen Sensor Bank 1 Sensor !)
The powertrain control module uses the oxygen sensor to calcultate the air/fuel ratio in the exhaust. The computer is receiving a low voltage indicating the system has a high content of oxygen
Probably Causes
1- Oxygen sensor defectif
2 - fuel system running lean-check other codes first
3- Engine vauum leak or misfire-repair
4 - low fuel pressure - fuel pump defective

To me its most likely the sensor, do they usually go out on cars with only 55,000 miles?
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12-03-2008, 08:15 PM
Post: #4
RE: Check engine light
May want to check out number 2-3 and 4 before the sensor. A restricted fuel filter can cause a lean condition.

Being way2old is why I need help from younger minds.

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