Hey.. I'm new.

Hey everyone. I'm new to TW. Have kinda known about Tacoma World through an old Insurance agent. Glad to be here.
So, I have a 2001 Tacoma 4x4 3.4L. Stick shift.It's my 3rd Toyota. Love those trucks. Anyway. Been having trouble for about the last year with a sensor. I think. It's starting to nickel and dime me. Already replaced both Cats. Then the upstream o2 sensor.
Finally got the check engine light to stay off. But then right after that had a problem with it cutting out while driving. So, we're going to change the master airflow sensor. It was parked for about two weeks. Then I started driving it again for the past three weeks. Driving fine, till today. The check engine light came back shortly after the worst rattling I've ever heard it make. So I had the code checked. Came back as Bank 1 Cat.
Anyone have any helpful information on this type of thing? Be much appreciated. Thanks!

 

Could you elaborate a bit more on the "rattling"? are we talking about a rattle like a belt slapping? or maybe the sensor came loose and is rattling while on the cat still?

 

I don't think it's a Belt. From inside it sounds like it's just on the other side of the firewall. It's Rattled before, but never this bad.

 

Hell if I know. But welcome to TW!!

 

Thanks Fam

 

Welcome to Tacoma World!!

 

We're you accelerating when you heard the rattling? Was it coming com the engine bay? If so maybe it's a bad case of pinging/pre detonation? When my truck was throwing a lean code (po171) it pinged/rattled pretty bad under throttle

 

kinda sounds like a burnt valve. do some compression checks. plus get a scanner so you can monitor fuel trims.

 

Eon_blue actually, yes, I was accelerating. And yes it was coming from the engine bay.

 

Shortly after the rattling it threw the check engine light. I took it to an auto part's store and the code came back as Bank 1 Cat.

 

Remember checking any code entails the complete circuit from the sensor to the ECM .

Burnt or damaged wires get missed quite often

Exhaust leak bolts came loose