Hi, My car's check engine light has been on for the past month, it does go of for a little while but instantly comes back on and tends to stay on ,whilst flashing a few times as well.My cousin has a fault code reader but nothing no cel error codes when plugged in ,so really confused.Car seems to drive well with no noticeable power loss.Any help would be great cheers

 

Disconnect the battery for half hour to reset the faults/cel.

Drive around and see what happens. If it throws the light up then theres a fault, if it doesn't then you're all good.

 

Cheers pal will give it a go.but the car was out of action for a few days only 2 weeks ago whilst waiting for a new battery to be delivered,since new batt fitted the cel has come back on, not straight away but after a short local drive

 

Bugeye stores error codes on EPROM so you have to actively clear with Select Monitor / SECS / OBD reader........disconnecting the battery resets the learning side of the ECU like the AIM.

Get your cousin to check for historic codes stored on the ECU.

Shaun

 

Shaun cheerz for the info..

 

Could it be the cel sensor thats damaged?

 

I had exactly the same problem with my Blobeye, CEL light flashing then staying on permanently with no error codes. Turns out to be the Neutral position switch.

https://www.scoobynet.com/general-te...ht-on-wrx.html

 

NPS problems generally leave historic misfire CELS. Camboflip, there is no specific sensor for the CEL light. The ECU monitors a shed load of things and then lights the CEL or makes it flash to bring something to your attention.

Which for the DENSO bug ECU can be a bit frustrating as it can go off randomly, usually the camshaft position sensor or the neutral position switch

Shaun

 

It didn't on mine and it was tested on 3 different diagnostic systems.

 

Yes exactly the same no error codes.Is the neutral position switch an easy job to replace, ive never heard of this switch until now cheers

 

Shaun cheers for all the info

 

It's an easier job on the WRX than on an STi due to the position of the switch.

https://www.scoobynet.com/lighting-a...-location.html

I got the local mobile mechanic to change mine, only charged me a tenner.

The switch itself isn't that expensive.

Take it yours is a WRX?

http://www.ebay.co.uk/itm/Impreza-2-...item3f261dcc4a

 

It is a wrx but with a sti 6speed gearbox. thanks for the links they're very good ,now I know where the switch is cheers again

 

I've got a WRX with a 6 speed gearbox.......mainly because the 5 speed kept breaking at over 400 BHP LOL

You need to drop the 6 speed box to change the NPS which is a bit of a pain.

However, you need to do a shed load of mods to a WRX to need a 6 speed box......maybe it's something else?

Usually by then you have changed the ECU and the CEL might be lit by a SIMTEK etc detecting knock........

Just curious why your bug WRX needs a 6 speed box...........

Shaun

 

Its our project ,plan to make it a quick car and to be tracked every month.have broke the transmission on one other car before,non subaru,so didn't want it happening again,plus had a very good deal on the 6speed, a guy from sutton Coldfield was breaking his sti 9 and sold it cheap(cash deal)

 

In general if you like to have fun in a wrx the brakes, suspension and gearbox if your aggressive in gears 1,2&3 than these will need changing.never liked being brutal in 1st and2nd on 5speed so lost out to many slower but quick cars in these gears

 

This is only my opinion of course cheers