Well, I have had the check engine light on for a couple of weeks and couldn't find anyone with a code reader so I bought one. ...Here's what I got:

P0125
P1135
P0171
P1130
P1133
P1135

..What do you think? ...I don't want to go to the Stealership.

 

I see a MAF sensor and/or an O2 sensor in there, but how does your RX drive, notice anything?

 

It seems to drive fine. I haven't noticed any change. I tried cleaning the MAF and carb cleaner down TB with no change. ...reset CE and it comes back immed. It's my understanding there is more than one O2 sensor. ...Does a particular one seem to go? By the way the car is a 2000 Rx300.
Thanks

 

The one immediately behind the engine block and before the precat is the one that occurs more often (and not just in the RX300 as I know plenty of others).

To this day, I am still surprised my original OEM cats have not bitten the dust with the bad gas I have down here. One of my precats bit it and they both had to be removed to avoid 'disco inferno' down below. Yet, the sensors keep on ticking.

 

Do you think I should replace that one? ...is there any way to test it before replacing it?

 

Well, the only thing that my uncle and I do is buy one and test it in both of the sockets in front of each precat (never did that on mine since I never had a problem) but have on some other vehicles.

One of other thing (as I am at my uncle's right now) that he ask me to mention and we did on a Jeep Grand Cherokee last weekend was to take the existing O2 sensors out and see if they were dirty.

Down here, we have nasty gas in my opinion and it is not suprising when we get someone come into my uncle's place and we use that fancy OBD scanner I bought him and it shows both O2 sensors on the fritz. A look at the O2 sensors shows it sometimes covered in gas or oil crud, often when the guy or gal had a near empty tank.

 

Thanks for your help. I think I'll pull them and see what they look like.
Thanks again.