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1) Did you make regular cleaning?
2) Sensor is not working properly(maybe a replacement of spare part is needed).
3) Maybe you just connected your usb cable to another port and it generated a copy, in that case, delete all printer Evolis drivers from control panel and enable it from beginning again.
The upper and heated O2 sensors should not be cleaned as depending on the cleaner, can destroy them anyway, and the right cleaner for the component can't clean them well enough. It's best to buy new if the ECU kicks out 02 sensor code errors.
First off, when was last healthy tune up? Plugs, plug wires, ALL filters and a good fuel system cleaning? I'd start there, then have parts store like Autozone, Advance etc.. do an OBII fault scan. I'm suspecting of tune up doesn't help maybe an oxygen sensor or a MAF (Mass Air Flow meter) are strong possibilities. But tune it first, and get scan done before just throwing parts at it.
possible solutions are, a dirty maf sensor. remove manifold air flow sensor and clean it with maf sensor cleaner. you can buy a can at any auto parts store to clean, take off and clean maf sensor, do not touch inside of sensor it is very fragil. when cleaning sensor be sure it is dry before installing it back on vehicle. also check for a vacuum hose leak downstream of maf sensor.make sure air filter is clean. this usually takes care of the problem. po171 and po174 are the same. you can use electrical cleaner to clean sensor also. also check for a dirty fuel filter and fuel pressure, if needbe.
Your AF module needs to be replaced. Or maybe the mirror part that bounces light to the AF module.
Another possible issue is light. The AF sensors need a certain amount to light to be able to see if its in focus. Some lenses don't allow that much light to pass, so the sensors can't focus the lens. Try a lens that passes more light, like the 50mm f/1.8 or point your lens at a very bright scene.
If increasing the light level doesn't solve it, it needs repair. You might check Ebay for a "parts" Rebel to have spare parts for your good one.
The ABS sensors are located in the bearing wheel hub assembly, "normally" these sensor's cannot be removed on most models but it may be possible on yours....This will require removing the tire, brake caliper and possibly the bearing hub....One thing you can do is carefully inspect the wiring going down to your wheel bearings, if you find damaged or frayed wiring or your connections look bad, you will end up most likely replacing the hub assembly. These are normally about 75-100 dollars each and they are not hard to replace yourself if you are somewhat handy with a wrench. A dealer can tell you which sensor is giving you the trouble, or maybe Pep Boys or some auto parts stores may be able to help in this way too. Most times this ABS light you have on is also associated with the "Trac Off" light on all the time too.