Subaru Legacy 2004 wagon Cali Emissions weird O2

[George Colgrove]

Hi I have been getting a too lean error code and my O2 sensor readings look all messed up. I recently had the head gaskets replaced. Any recommendations?

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[college man]

Do you have the code you got? Lean is not enough fuel or compression loss or a faulty sensor.

https://www.ericthecarguy.com/faq/solving-automotive-performance-issues

[George Colgrove]

The error code is P2096. After the head gasket work the mechanic said the compression was good. So do all the O2 sensors need to be replaced?

[college man]

[quote=”CaptainGlac1er” post=177405]The error code is P2096. After the head gasket work the mechanic said the compression was good. So do all the O2 sensors need to be replaced?[/quote]

Compression is good. Either fuel or spark to check next.

https://www.obd-codes.com/p2096

[George Colgrove]

The spark plugs looked fine on the passenger side. How would I check the fuel system on a subaru?

[college man]

[quote=”CaptainGlac1er” post=177797]The spark plugs looked fine on the passenger side. How would I check the fuel system on a subaru?[/quote]

[George Colgrove]

If it helps this is what the engine sounds like.

[college man]

[quote=”CaptainGlac1er” post=177805]If it helps this is what the engine sounds like.
https://youtube.com/watch?feature=youtu.be&v=t9DM_caS-ts%5B/quote%5D

I’m not sure if that noise is coming from the belts and pulleys. You may need to
remove the belt and see if the noise goes away. If so something is making the noise.
I don’t think a lean code would make that noise.

https://www.ericthecarguy.com/faq/diagnosing-noises-in-your-car

[George Colgrove]

Cleaned the MAF sensor and fixed one possible vacuum leak and this is the readings I get now. The engine can accelerate a bit faster now.

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