P1133 A/F Sensor or O2 Sensor
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Driver School Candidate
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From: Texas
P1133 A/F Sensor or O2 Sensor
OK, I have searched extensively, and I haven't been able to find the answer, so I though I would ask. My car is a 1999 ES300.
My CEL lit up, and Autozone informed me that it was P1133. This shows to be an A/F sensor issue for Bank 1 Sensor 1. I figured out that this is the sensor by the firewall--the one that is difficult to reach.
I am wondering if anyone has the correct Denso part number. I ordered from Amazon the Denso 234-9007, but the wire is too short. Can anyone tell me which Densor sensor has the longer wire necessary for Bank 1 Sensor 1? The car is not California emissions.
Also, does anyone know the difference between the A/F sensor and the O2 sensor? Is the difference that the A/F sensor is required for California cars, while the O2 sensor is for cars with non-California emissions?
FYI, I think I answered my own question. Last year, I replaced the Bank 2 Sensor 1 with Denso 234-9009. 234-9009 has a wire that is several inches longer than 234-9007. 234-9009 worked fine on the sensor up front by the radiator, and it appears that the shorter 9007 would have worked there as well. But the Bank 1 Sensor 1 requires the longer 9009. The wire on the 9007 is not long enough to work for Bank 1 Sensor 1, but the 234-9009 is long enough to work on either. In any event, the 9009 that I used on the sensor up front solved my CEL issue last year, and I am going to replace the 9007 I ordered for another 9009 to use on the sensor by the firewall.
My CEL lit up, and Autozone informed me that it was P1133. This shows to be an A/F sensor issue for Bank 1 Sensor 1. I figured out that this is the sensor by the firewall--the one that is difficult to reach.
I am wondering if anyone has the correct Denso part number. I ordered from Amazon the Denso 234-9007, but the wire is too short. Can anyone tell me which Densor sensor has the longer wire necessary for Bank 1 Sensor 1? The car is not California emissions.
Also, does anyone know the difference between the A/F sensor and the O2 sensor? Is the difference that the A/F sensor is required for California cars, while the O2 sensor is for cars with non-California emissions?
FYI, I think I answered my own question. Last year, I replaced the Bank 2 Sensor 1 with Denso 234-9009. 234-9009 has a wire that is several inches longer than 234-9007. 234-9009 worked fine on the sensor up front by the radiator, and it appears that the shorter 9007 would have worked there as well. But the Bank 1 Sensor 1 requires the longer 9009. The wire on the 9007 is not long enough to work for Bank 1 Sensor 1, but the 234-9009 is long enough to work on either. In any event, the 9009 that I used on the sensor up front solved my CEL issue last year, and I am going to replace the 9007 I ordered for another 9009 to use on the sensor by the firewall.
Last edited by SMUChris; Dec 16, 2012 at 12:50 PM. Reason: Additional Information
234-9009 is an Air/Fuel sensor for California Emissions vehicles. That is what I used on my 1998 ES300. I double checked that my car had CA emission standards by sending my VIN to a dealer and by looking under the hood - the emissions sticker had "CA" written on it.
One sure way to check if your car has "O2" sensors or "A/F" sensors, is by looking at the original sensor probe.
A/F sensors have a few little holes like this:
O2 sensors have lots of bigger holes:
In short, both sensors can be called by either name, but in this instance, Denso use the A/F designation for their more advanced models that have a wider sensor range and a faster response. That is why the cheaper version is used "downstream", or after the Catalytic Converters, because they're only there to double check the work of the more advanced sensors.
One sure way to check if your car has "O2" sensors or "A/F" sensors, is by looking at the original sensor probe.
A/F sensors have a few little holes like this:
O2 sensors have lots of bigger holes:
In short, both sensors can be called by either name, but in this instance, Denso use the A/F designation for their more advanced models that have a wider sensor range and a faster response. That is why the cheaper version is used "downstream", or after the Catalytic Converters, because they're only there to double check the work of the more advanced sensors.
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