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Your uncle could be right. It is always best to make sure you put the correct fuel for your make and model in the tank. Don't put in any additives unless approved by the vehicle manufacturer. The catalytic converter in the exhaust system is what reduces the CO and NOX in your exhaust. It has a catalyst in there which causes certain chemical reactions in the exhaust. Firstly the converter must reach operating temperature, so before you get the exhaust checked make sure your cars exhaust is nice and hot, a five minute drive up to the inspection station first thing in the morning may not get the converter to the operating temperature. The other problem may be as your uncle said. The injector cleaner may have put out certain chemicals into the exhaust that have put a fine layer of residue in the converter. This will block the NOX from getting to the catalyst and therefore stop or lower the reduction. You may have to replace the converter (they are expensive here in Australia) but you should try and take the car for a long easy drive in the hope that it will burn off the residue (if there is any in the converter) and then go and have the levels checked, the converter should be hot enough to do its job by then. You may also want to try another inspection station on the other side of town or another town depending on the distance, that will get the converter to operating temperature and the inspection stations meter may be calibrated better than the one you are going so it will give a better reading!
I would say 10 to 20 miles would be enough to tell if the trouble codes will return. You may be able to disconnect the battery for a couple of hours to clear the codes, but using a scanner or code reader is better. A scanner or code reader can find history trouble codes on some models and in some cases without the engine light being on. The purpose of the warning light is to tell the driver the vehicle needs attention now.
Hello, you probably have a trouble code P0506 stored in the system, this will keep from passing test. real simple fix. the throttle body is dirty, this will cause not enough air around the throttle body. simply clean out the inside of the throttle body around the throttle plate and bore. you will need to use throttle body cleaner or carb cleaner
could be a slight air leak on the exhaust like a small rust hole and its drawing in the air ,the proper way is to put a probe up the tailpipe but without knowing what the results were its very difficult to diagnose ,was it too high on O2 as this signifies a hole in the exhaust ,was it too high on CO or CO2 ,You see our test is every year on vehicles over ten years of age and it also includes a mechanical test as well but the emmisions is done with a probe not the OBDII as very few europeon vehicles can be read via the OBDII as they nearly all use encrypted software now from 2005 .
Putting miles on them wont reset the computer. It is how many times you cycle the key on and off. And they will only reset if the problem was fixed. I don't know how many times yours has to be cycled, but some vehicles are up to 100 times. Hope this helps.
the car is older that 1996 there for you dont need emissions testing. if you wish to pass, check the carbon canister and the egr valve. if the temp gauge says the cars not over heating and the engine doesnt appear to be hot, dont worry about it.