Somebody gimme the 02 sensor part number for my '99 SLE. K engine.

thanks.

Straight out of Tech Info:
98-02 VIN# K,1 POSN1
GM# 25312203 (AC Delco #AFS-109)

Order it from gmpartsdirect.com for the best savings.

Is your MPG getting bad? I replaced mine at 115K or so and didn't notice any improvement. Still consistently getting 27 MPG with 131K miles.

Mark: Nope, no change in mileage (around 20) since I rolled the car new from the factory. That'* a lot less than many here claim, but running on California'* crappy "reformulated" gasoline.

So, it'* a maintenance item. If i wind up with a coupla more MPG, that won't take long to pay for at current gas prices.