2006 Infiniti M35 Start Issues

[hsingh2088]

I have an issue with my car and I am not really sure how to diagnose it.

1.) I've had an SEL on for the past 1.5 months due to a bank 2 catalytic converter code. I am not sure if I need to replace the cat or the O2 sensor.

2.) When I attempt to start the car, it turns on for a brief second, then the circuit completely cuts off and the car becomes dead. After waiting for about 15 to 20 seconds, I repeatedly press lock/unlock on my key fob and eventually the circuit comes back and the car turns over

3.) I replaced my battery about 3 months ago so it should not be that

I am not sure what the problem is. Has anyone else exhibited this issue? Anyone have any clue what it may be?

[svard75]

What are the codes you pulled? I too have the cat below efficiency code P0430. It's the cat not the o2 sensor.

[pedsemdoc]

Even though you just bought the battery, I'd make sure it's got good voltage under load--might have been a bad one, before looking for other gremlins in the electrical systems.

[svard75]

I don't know dude. He is able to start the car. Perhaps the alternator is bad? Do you still have belts driving your accessories? I know that sounds funny but I've witnessed this before.

[hsingh2088]

I don't know dude. He is able to start the car. Perhaps the alternator is bad? Do you still have belts driving your accessories? I know that sounds funny but I've witnessed this before.

I haven't checked the belts. How can I diagnose the alternator? Do you think it has anything to do with potentially a bad O2 sensor and the fact that the ECU is getting signal to shut the car off because of it?

[hsingh2088]

What are the codes you pulled? I too have the cat below efficiency code P0430. It's the cat not the o2 sensor.

P0430

[svard75]

Nope. I have had that code for over a year now. It doesn't do anything to my car that is noticeable. I was thinking if your car shuts off after starting perhaps it's the alternator but then again you would see a battery light on your dash. And it would likely not start again. Start by clearing your codes and see if the car runs properly after. I doubt that code has anything to do with the car shutting down.