I have a 98 audi a4 2.8 fwd with 109 on it and it failed the emissions test. ?

The two parts that it failed were CO and HC, it passed NOx. I've been informed that it is probably running rich due to a failed sensor. Is this true, how much should I pay for repair, and with tools and a chilton can I do this on my own?

I have a 98 audi a4 2.8 fwd with 109 on it and it failed the emissions test. ?Exhaust may be blowing, EGR valve may be caked in rubbish,Air Flow Sensor may be faulty, PCV system, Lambda Sensors located on the Exhausts may be faulty, Good Luck and also try adding some fuel system cleaner into the fuel tank to clear all of the rubbish, leoI have a 98 audi a4 2.8 fwd with 109 on it and it failed the emissions test. ?1. Check your oxygen sensor (the 2.8 has two, one near the end of each exhaust header) this accounts for most emissions failures.



2. Your MAF sensor may be bad; it measures the amount of incoming air and adusts the amount of fuel, accordingly. It is the black, tube-like extension coming out of your air cleaner box.



Check blauparts.com or bimmerparts.com for replacements; none are inexpensive...all are easily replaced in your driveway with common handtools; assuming you have some mechanical talent...



Do not discount a clean airfilter, a change of oil, and a tank full of higher octane gas (or full tank with octane boost).



I have a 98 audi a4 2.8 fwd with 109 on it and it failed the emissions test. ?Trust me on this Add seafoam to you gas before you reinspect I works wonders I have had to High milage hondas that failed inspection due to emissions Added Seafoam passed with flying colors.



You can buy seafoam at autozone it comes in a white can with red lettering



Good Luck and if you use it, it will work!I have a 98 audi a4 2.8 fwd with 109 on it and it failed the emissions test. ?
Chances are that your PCV system is clogged up a little, and so is your idle air control valve. These items should be cleaned out thoroughly with butyl cello-solve and Gum-out. So should your throttle body. After all these things have been cleaned, install a new set of GK iridium spark plugs. If you haven't been using Mobil One or ELF oil, begin doing so. This will prevent further clogging of the PVC system. Also, at this mileage, the timing belt should be changed as well as the water pump. If you haven't done this yet, be sure to use only GENUINE AUDI COOLANT. Make sure that the oil you use has an ACEA approval rating. Good Luck!!

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