i need a new O2 sensor,cars running rich and idles very rough when cold keeps wantin to stall,read many reports about what will fit and what wont will mine be a 3 or 4 wire,can only see 3 comin of of the downpipe but there may be abother one ie earth.Secondly is it a subaru only job or would one like this work
SUBARU IMPREZA WRX TURBO LAMBDA SENSOR DIRECT 4 WIRE on eBay Subaru, Car Parts, Cars, Parts Vehicles (item 250147214276 end time 24-Aug-07 18:45:55 BST)
Any help will be much appreciated

 

i have a my99. my o2 sensor was 3 wire one first i bought a pattern one which did not last a year .so if i was you get a subaru one. i think mine cost about £150 if i can remember the 2 white wires are heater black signal hope that helps
scott