The Subaru CEL thread

[kscoob]

2008 Subaru Impreza 2.5i Sedan stock, 113k miles

Codes: p2096, p0137

My exhaust was leaking at multiple points. After I got this fixed, the codes came back after a few days. When cleared, the CEL will illuminate after a few mins driving on the highway.

I believe that the Upstream AF sensor has a rich bias. About 5 minutes after the car warms up, it produces a consistent negative current (-0.05-0 mA). Its voltage is 2.1-2.2 V. In that time the LTFT drops from 0 to -4%.

The downstream O2 sensor provides reasonable values at first, in the 1.2-0.4 V range. However this gradually drops to 0.01-0.02 V.

The MAF sensor appears to be responsive, increasing with engine RPM.
2 g/s at idle, 10 g/s at 3000RPM.

I dont hear any vac leak whistles while the engine is being revved with the hood up.

Any ideas?

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[GoranNoSuponsaa]

2007 Impreza 2.5i Wagon, stock, 136k miles

Code: P0171 System Too Lean (Bank 1)

Taking a look at this in a bit. Either dirty MAF or serious vacuum leak. Built a DIY smoke tester out of a soldering iron and a pickle jar. Will update when I clear the code.

[Jerpster]

Here's one for you. I'm posting in this not because of a code. But the lack there of.

I'm the third owner of my 08 wrx. It has 155k miles. I bought it at 100k. Timing belt was done by PO at 90K. Paperwork to prove it was done. It was after my idler pulley exploded that I realized only belt and tensioner pulley were replaced. So I'm here about the lack of P0340 0345 codes. I have the timing belt cover off and found the issue.

Might I be the luckiest man in the world and just need to replace broken cog pulley check timing and replace timing belt water pump and compression test?

Thoughts?

[aswresm]

Any idea what to look for when trying to fix that CEL. T
Thanks in advance.