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I just had the battery and alternator tested. They are both good. Any ideas will be greatly appreciated

I believe it was replaced with OEM. Before I had the alternator replaced I had it, and the battery tested. I was told, the battery was good, and the alternator regulator was bad…….

Hello all. I have a 2014 Infiniti QX80. The brake light (BRAKE) and battery light flash every time I slow down. I just had the alternator replaced a month ago, when this first happened. Ideas?

How would I find out?

Does the extension go in the front or back?

I received the extension. This goes on the front O2 sensor?

You sent me a link to purchase an extender. Will that one also work for my QX? Or do I need a different one?

I also have this exact same code for my 2014 Infiniti QX80. Would an extender work that also?

I will definitely add the extender. Thank you for your help. I’ll update you soon.

So will the extension make the code not reappear?

The only code I get is P0420 Catalyst System Efficiency Below Threshold (Bank 1)

I’m sorry for all the questions, I just want to make sure I understand. So I shouldn’t change any sensors at all, just add the extension? And that’s to the rear?

Do I need 4 sensors since there are 2 cats?

Ok thank you. I’ll order the extender, and the 2 O2 sensors. What issue would this fix? Just the codes recurring?

So I should wait to replace the sensors until I replace both cats? They’re are 2 correct?

Oh wow! That’s great.

Code P0420 (Catalyst System Efficiency Below Threshold (Bank 1). That’s the exact code I’m getting

We don’t have emission testing here. I just don’t want to pay to replace the cat if I don’t have to. But now you have me thinking maybe I should. It’s my daughters car, and she freaks out with an engine light on.

Thank you again. So, I’m not very mechanically knowledgeable like others, so I appreciate the info. But, how do I know if it’s actually a bad cat?