Fouled O2 sensor help.

[Csimpson]

I have a 1998 Dodge Ram 1500 with the 5.9 engine. I got a check engine light with a P0138 code. I pulled the downstream O2 sensor like the code suggests. It was pretty black. I have noticed that the truck has been burning through the oil which is why im sure the O2 sensor is bad. I am going to replace the O2 sensor, but I am wondering where I should start looking to try and solve the bigger issue?

 

[bigdodge]

The intake plenum gasket is probably leaking oil into the intake causing it. Very common on those engine's

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[Csimpson]

Ok, I guess I will start there, thanks.

 

[Hero6]

if you are burning oil, I would start with a compression check. This will tell you if its getting by your rings.