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HI UNFORTUNATELY WITHOUT ANY FURTHER DETAILS ON THE "U" CODE SUCH AS NUMBERS ETC I CAN'T HELP YOU WITH THIS, BUT TO HELP YOU WITH THE SMOG TEST I SUGGEST A PRODUCT CALLED CATA-CLEAN, I HAVE SEVERAL VEHICLES ONE BEING A 4.0L 1996 JEEP GRAND CHEROKEE & AFTER PUTTING THIS STUFF IN PRIOR TO TAKING FOR ITS ANNUAL MOT TEST IT SAILED THROUGH, THE EXAMINER ASKED WHAT I HAD DONE , I TOLD HIM AS ITS PERFECTLY LEGAL & HE REPLIED THAT MOST OF THE "NEW" (UNDER 3YRS OLD)CARS HE TESTS HAVE HIGHER CO2 EMISSIONS THAN WHAT MY JEEP WENT TROUGH AT, HE ACTUALLY SHOWED ME THE REPORTS THAT MADE MY 16YR OLD BEAST ONE OF THE BEST (THIRD FROM THE TOP) TESTED FOR EMISSIONS THAT WHOLE YEAR - CHUFFED - I CERTAINLY WAS - I CAN WHOLEHEARTEDLY RECOMMEND THIS PRODUCT TO GET YOU THROUGH AN EMISSIONS TEST , BUT WITHOUT FURTHER DETAILS ON THIS "U" CODE I CAN'T BE OF ANY SERVICE.
its most likely a catalytic converter issue. they are usually only good for 10 years, mileage has no bearing on their lifespan. the precious metals inside wear out over time, not miles. in many parts of the country where we dont have smog tests most folks dont even know they have a failed converter untill the dang thing falls off the car.
I suffered a similar failure on my little Rover. I think you will find out the resistor on the blower has had it. It is probably similar in theory. The resistor block contains several resistors. As you alter the blower speed, different resistors are used. One of yours has obviously failed. You need to replace the resistor block, which may be located at the back of the engine bay, on the passenger side, under the wiper module. Or you can remove the resistor block and replace the failed resistor - a competent auto-electrician can do this, or advise you how to.
trade it in on the scrappage scheme against a new one .or take it to an authorised garage for emmisions ,cant just point a finger at a certain component and say change that .Sorry but without the right equipment i would only be making educated guesses .What condition is the air filter in ---did you clean it before you went for the test
try driving the vehicle around for 5 to 10 minutes before testing. the catalytic converter, which is what breaks down most of the pollutants, is heated by the engine exhaust and doesn't function efficiently until it is at about 1000 degrees Fahrenheit.
You could install a new catalytic converter and oxygen sensor for under $200 instead of paying someone to tell you the same thing. If you go that route, you can get cheap parts at Quadratec.com or just plain old Autozone. You just have to cut the old cat off and clamp a new one on. I did mine in about an hour. The O2 sensor is easy too. On a side note, make sure your car is drive at highway speed for around 20 minutes to ensure the cat is hot enough to properly work.