Hi all,

I have a 1996 Chevrolet Suburban, model K1500.

I got a smog test done recently, and the smog check machine came back with these codes:

P0154: O2 Sensor Circuit NO activity detected.

P0155: O2 Sensor Heater Circuit Circuit

P0304: Cylinder 4 Misfire detected.

The O2 sensors have been replaced 2 times already, and they keep going bad.

At this point, would it even be worth it to try to get it fixed?

Should I take it to a real shop to get a complete diagnostic?

Thanks for your thoughts,

Iditarod