Need some advice. Just took my 1997 Cherokee in to have the Cat and front O2 sensor replaced. Driving home, the check engine light comes on. Took her to Autozone and the diagnostic gave me a P0132 code (heated oxygen sensor) and the possible causes it lists are : Fuel system running rich, High fuel pressure-fuel return line blocked or pressure regulator defective, and Fuel pressure regulator leaking. Any advice? One more thing, I'm getting REALLY crappy gas mileage. No smell of fuel from the exhaust while running, so I am at wits end. Any advice would be great! Thanx guys!

 

Check the O2 Sensor fuse.
Check the wiring/connection for the downstream O2 sensor.