Hey guys my 01 gs300 recently started making a whine and went kinda limp so o reset the computer to see if a senor was messed up or misreading . So it all went away then came back so since it sounds like it’s sucking a lot of air I unplugged the maf to see if it was Mac sensor. And I didn’t reset the code which is why I should P0100 but do you haves have any ideas on P0100 never heard of a intake air temp sensor before but it sounds pretty important and anybody know the location. And I know P0135 is for O2 sensor had it for awhile now.

 

The IAT (intake air temp) sensor is integrated with the MAF. Try cleaning it with maf cleaner.

 

I got it all figured out the issue I’m stuck on is that I found out the whole issue is coming from the cat/o2 sensor how would I know which one I need replaced. My check engine kept throwing 02 heater circuit and I took off the o2 sensor granted it’s loud as hell. But it fixed all my issues now do I need the actual cat or just the sensor

 

That code is for Bank 1 sensor 1 which is the front upper o2 sensor. So on the inline six layout, the front three cylinders (closest to the radiator) make up bank 1. And the rear three (closest to the firewall) make up bank 2. The farthest font and up in the engine bay is the sensor that needs replaced. Heater circuit codes can be cause by wire/connector issues, but 9/10 times its an internal failure of the o2 sensor. So if you don't see an obvious wore issue, go ahead and replace the sensor.

 

Have you heard of rockauto sensors being alright? I see there’s a lot of more affordable options than local auto parts store but is it worth getting them?

 

Rock sells everything from cheap to top of the line. Id suggest Denso or NTK. But you can throw a cheap one in. Up to you.