2004 Forester Check Engine light on... What could it be?

Subaru Forums Subaru Forester
1

The dealer mentioned it was showing a code for one of the o2 sensors, but they couldn’t say for sure if that was the problem. I replaced both sensors myself, but the light came back on. Any ideas on what else it could be or how to figure it out without spending a lot of money at the mechanic? Thanks!

2

I had a similar issue with my 04 2.5X. I had to use a spark plug extender and put the o2 sensor in that to get the code to go away.

3

Try scanning the code, clear it, and then drive for a bit. If the code doesn’t come back, it might not be an issue.

4

FrankRich2 said:
Try scanning the code, clear it, and then drive for a bit. If the code doesn’t come back, it might not be an issue.

I cleared the code by unplugging the battery for 30 mins. Does using one of those OBD2 gadgets do anything different?

5

I cleared the code by unplugging the battery for 30 mins. Does using one of those OBD2 gadgets do anything different?

6

Maybe you need to show the sensor who’s boss!

7

Dolph said:
Maybe you need to show the sensor who’s boss!

Hohoho, funny…

8

Smith said:

Dolph said:
Maybe you need to show the sensor who’s boss!

Hohoho, funny…

I’m sorry. Good luck figuring it out!