Gary Dowie

Cleaned throttle body (removed to get both sides) changed the coil pack & washed exterior.

Car runs well whilst cold but when the engine is warm it starts to loose power and sounds like it's only firing on 3 cylinders. Denso o2 sensor ordered from the States. Turned my coil had an intermittent fault that i dicovered. Changed the coil pack and I've had 2days of faultless driving. Fingers crossed it's now fixed.

Car runs well whilst cold but when the engine is warm it starts to loose power and sounds like it's only firing on 3 cylinders. Denso o2 sensor ordered from the States.

Changed the front o2 sensor. Seems to have fixed a MAJOR issue.

Both o2 sensor changed now and after the front one was changed all seems good after a very short run. So time to get it booked in for its MOT.

Ok so ive just ordered the genuine Subaru o2 sensor should be here for Wednesday will get that fitted next weekend. I'll post up if there's any change. So far I've 1. Put into a garage only to find 1 fault code indicating the 2nd o2 sensor. This was changed, no fault codes. Spark plugs and HT leads changed. Same issue. 2. Had the same garage check out the fuel pump. All good flow and pressure. 3. Changed the fuel filter in the engine bay along with the air filter, still nothing. 4. Got a replacement coil pack, map sensor and PCV valve. No change still got this same issue. If this o2 sensor doesn't sort it out in really not sure what else to do. Especially with no fault codes!

Has anyone installed a Denso 234-5003 o2 sensor? Can only seem to order from the States so want to make sure I'm getting the right one.

Haven't tried tuning with the MAP unplugged but did run with the Cat off with no change. Think it will be Thursday or Friday I'll get a chance to next look at it as I'm working late this week for a couple of days. It's so frustrating.

Yeah it sits at the back of the engine bay.

I'm going to get a new front o2 sensor. Where's the best place to get one and does any one have a part number?

Yeah the air filter is new too. I'm now thinking it might be a coil pack issue.

Hi people Ive had my forester for 4 months and recently started loosing power under acceleration and becomes a bit spluttery. I've replaced an o2 sensor that came up on the fault reader at a local garage along with new HT leads & spark plugs which made it a little better for a few weeks. Today I replace the external fuel filter and took off the Cat to see if it was blocked but I still have the same problem. This only seems to be an issue under acceleration. My MOT is due on Tuesday and this whole thing is really getting on my nerves. I know this car can be just right for me but am almost at the point of giving up on it. It's a 2002 non turbo 2.0l i.

Hi people I'm new to scoobys and have had my forester for 4months. Currently living in the Scottish Highlands.