I'm suppose to leave town now but now my car (em1) won't start. It has been showing a CEL, which is a code 61, primary oxygen sensor. I've already search but nothing much came up. so my question is where is it located and how to replace it, thanks.

The CEL light has been on for a month or so and the car still cranked. It was working perfectly yesterday but now the car won't start.

 

ttt

 

Does anyone know how to replace the primary oxygen sensory?

 

The sensor is easy to access in the exhaust manifold. You'll need an O2 sensor socket tool to remove and replace. A bad O2 sensor is an unlikely cause for a no-start condition. Check for spark at the plugs and listen for the fuel pump priming for a few seconds when you turn the ignition key to ON.