New around here and to Subaru and in a spot of bother.

Have a standard 2.0 Legacy 2004

My CEL came on recently.
It doesn't come on until the car has been running for a minute.

Got my mechanic to run diagnostics and came up that lambda sensor no 1 wasn't working.

He ordered and fitted a Prewired Bosch sensor specifically for the car. No change on the CEL front and apparently the same fault.

Any advice?

 

did he reset the ecu ?
try disconnecting the battery overnight and see if that sorts it.

 

As above he proberly didnt reset the ecu,you can also buy a diagnostic readers on ebay for about £20 these find faults and they can also turn of the cell light

 

i bought one of the diagnostic readers of e-bay u-480 for £22 it picked my fault up and reset my cel light

 

Thanks lads.

Left battery disconnected all night, no change.
Got ECU reset by diagnostics.

Coming up as P0131, o2 sensor circuit low voltage (Bank 1 Sensor 1)

 

As long as it was reset with a diagnostic tool there must have been 2 faults i dont think turning of power works on newage as they can store old problems glad you got it sorted

 

I think on New Age Impreza,Forester(on this i'm pretty sure) or Newer Legacy is direct replacement of O2 sensor Denso not Bosch.
Probably due this you have still CEL....


Jura