mse5787

Can any give me an idea of what this code means, and what I can do to fix it. I just replaced all 4 02 sensors a few weeks ago, this popped up yesterday evening.

Any help is appreciated

Matt

JCON

What does that mean?
This involves the front oxygen sensor on Bank 1. This code indicates the engine air fuel ratio is not being adjusted by the oxygen sensor signal or the ECM as expected to do so, or not adjusted as often as expected to do so once the engine is warmed or under normal engine use.

Symptoms
You will likely not notice any drivability problems, although there may be symptoms.

Causes
A code P0133 may mean that one or more of the following has happened: The oxygen sensor is faulty The wiring to the sensor is broken / frayed There is an exhaust leak

Possible Solutions
The simplest thing to do is to reset the code and see if it comes back. If the code comes back, the problem is more than likely the front Bank 1 oxygen sensor.
You will likely wind up replacing it but you should also consider these possible solutions:
Check and fix any exhaust leaks
Check for wiring problems (shorted, frayed wires)
Check the frequency and amplitude of the oxygen sensor (advanced)
Check for a deteriorating / contaminated oxygen sensor, replace if necessary
Check for inlet air leaks
Check the MAF sensor for proper operation


Read more at: http://www.obd-codes.com/p0133
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mse5787

thank you jcon, can you answer this is this code talking about the sensor on the driver side before the cat?

moosestang

Yes it's the upstream sensor (before the cat). Did you replace them with Bosch or motorcraft? Bosch sensors have a history of having slow response time on these cars.

SpartaPerformance

I believe bank one is passenger side, same side as cylinder 1. Yes it's the 1st sensor. I also agree with Moose, make sure you have Motorcraft sensors. Aftermarket ones are mostly junk, no good quality control resistance in the sensors could be off etc.... If they are Motorcraft then follow the diag sheet posted above. Why did you replace sensor anyway? Spending money at "guessing" problem is more expensive then having properly diagnosed and replacing parts with OEM components.

mse5787

yah it is a bosch sensor