Error code P1133

[H8892711]

Does anyone have an idea what this code stands for? I have a 1996 Camry 4cyl with 85000 miles. My scan reader tells me only to see Toyota. The vehicle acts normal, except for the check eng light. I haven't gone through a tank of gas to know whether my mpg has dropped off. Prior to this I had a PO171 and a PO125. I changed the O2 sensor in bank 1 and that seemed to resolve the problem.

When the car was new, I took a base line of how the car was running at idle and at 55mph, in anticipation of a future problem. My LTF1 and STF1 readings were off after the MIL went on. I also had a sulfur smell just prior to the light going on. The new ox sensor returned the reaqdings to just the way they read when I took the base line. Three days later, I now get the P1133 code. Any clues out there.\?

[nhparrot]

There is no DTC P1133 listed in the 96 Camry Service Manual. P0171 is System too Lean (Fuel Trim), P0125 is Insufficient Coolant Temp. for Closed Loop Fuel Control.

[melsauto]

Originally Posted by nhparrot

There is no DTC P1133 listed in the 96 Camry Service Manual. P0171 is System too Lean (Fuel Trim), P0125 is Insufficient Coolant Temp. for Closed Loop Fuel Control.

Here is what i did on a problem car:
1997 Toyota Camry
Engine: 2.2 L / 132 CID / 4 cyl / Gas / DOHC
Fuel: Fuel Injection / port fuel
Ignition: Distributorless
Trans: 4-speed Automatic Transaxle (Electronic)
Mileage: 67,000 mi
Emissions: OBD-II Compliant
VIN: T1BG22KXVU
check engine light (DTC1133) as a faulty air/fuel sensor
If you are sure this is a CA spec. vehicle. The air/fuel ratio sensor is the thing you should replace.There are multiple tsbs on 4cyl air fuel sensors.
you may have a bad ecm also. the heater circut is usually the
root cause to most of the air/fuel senser problems.with the
circut turned on you should have a 7amp draw. after the heater
circut is repaired you may have to replace the a/f sensor
Good luck!

[nhparrot]

Found it:

P1133 A/F Sensor Circuit Response Malfunction
(Only for California Spec.)

After engine is warmed up, and during vehicle driving at engine
speed 1,600 rpm or more and vehicle speed 60 km/h (38
mph) or more, the response characteristic of A/F sensor becomes
deteriorated (2 trip detection logic)

Trouble Area: A/F sensor

[frankcamry]

Hi, new to this forum.
I also have the same CEL code of P0171 and P1133 on my 1977 4cyl. Camry with 100K on it. Can anyone tell me where is the A/F sensor is located? and is A/F sensor means oxygen sensor. I want to DIY this issue. If anyone can share their experience, exact location of the sensor and how much does it cost, it'll be much appreciated. Someone was mentioning that I need to replace the MAF sensor, but I confirmed with the dealer 97 4cyl Camry don't have one.
Thanks
Frank

[frankcamry]

Anyone????

[cjagadheshan]

I have the same issue Frank Camry has. 99 camry 4 cyl - CA emissions vehicle - 91k - mpg dropped from 24 to 19.

Is it the A/F sensor ? If so where is it located. I see one before the Catalytic converter. This is right in front when we open the hood. Is this the one. P0171 said Bank 1 too lean.

Please help.