kyote

Can someone give me an idea of CEL code P1133?
Not sure what happened, but had CEL light come on with P0300,P0301,P0302, P0303, P1130, P1133
come up on my 2000 rx300 a few days ago. I found one coil pack bad (front passenger) and changed the plugs. I'm pretty sure the P1130 is the air/fuel sensor on exaust manafold. Not sure what the P1133 is though.
I have 104k on it, but very little trouble in the past. Has anyone ever heard of so many codes at one time? Any help will be appreciated.

Lexmex

P1130 and P1133 both are bank 1 sensor 1 for the a/f sensor behind the engine block.

When you get a misfire (those P03XX codes), that dumps raw fuel in. Two of those misfire codes, P0301 and P0303 are the rear bank and that can be enough to play havoc with the a/f sensor whereas a single misfire (such as P0302) on the front bank may or may not do anything. If you're still getting the code, I'd be inclined to run some fuel injector cleaner in the gasoline first (that's always good advice after replacing an ignition coil after a misfire) and then check with someone who has an advanced OBD2 scanner that can read the voltage levels on the A/F sensors. That was one of the main reasons I bought my Elmscan5 Compact OBD2 reader for use with my laptop.

kyote

Thanks Lexmex. I used your post to change the plugs last night, it was a great help!
I also changed the coil pack on the front passenger side, engine ran great afterwards. Still getting CEL and believe it is the A/F sensor. are you saying that the p1133 and p1130 could be the same sensor, the one you have pictured? Would you run the injector cleaner thru before doing anything with the A/F sensor?
thanks for your help on this.

Lexmex

It's the same sensor. Yes, run the fuel injector cleaner through the system before doing anything there.

bearbrew

Lexmex,

Any preference for injector cleaner?

Thank you,

Bearbrew

gazi001

Hi Ron, what is the standard voltage level for a/f sensor?

Lexmex

Redline Fuel System Cleaner (Pep Boys sells this), if not Lucas Fuel Injector Cleaner is available just about anywhere and that also does a good job. Amsoil is another excellent one, but tough to find. Some Carquest stores carry Amsoil.

Lexmex

Checking it with an OBD2 scanner, you should see the levels hovering around .660V most of the time.

salimshah

Try to use cleaners close to oil change [not a must but preferred]. The cleaner and the junk makes it way to the oil.

Salim