jazz_12v

<center><img src="http://pictureposter.audiworld.com/70143/p2170002.jpg"></center><p>Friday- On the way to work the other day something very bad happened. I had just merged onto the highway and a few minuets later driving in 5th gear doing about 75, I felt a major decrease in acceleration. It felt as if someone was holding their hand over the inlet of my intake and my exhaust was making a chocking noise. 5 miles later I exited the highway as I was loosing power rapidly and headed for the nearest gas station. Checked cone filter that was ok. Checked all fluids .. ok... so I decide I'm gonna have to bring it to someone but first I better fill it up with some gas. 6 dollars later and swing around the block everything seems fine.. until


Monday, halfway up the same highway to work I notice a sudden decrease in power and the same chocking nose from the exhaust. At work run the vag-com and pull the following dtcs:

17509 - O2S: B1 S1: Voltage too Low / Air Leak
92-00 - Unknown Error Elaboration
17514 - O2S: B2 S1: Voltage too Low / Air Leak
92-00 - Unknown Error Elaboration
16785 - EGR System: Insufficient Flow
93-00 - Unknown Error Elaboration
16525 - O2S B1 S2: Heating Circuit Failure
92-00 - Unknown Error Elaboration
17513 - O2S Heating: B1 S2: Heating Circuit Short to Plus
92-00 - Unknown Error Elaboration
18014 - Rough Road/Engine Torque Signal from ABS Cont. Electrical Malfunction
92-00 - Unknown Error Elaboration
16685 - Cylinder 1 Misfire Detected
92-00 - Unknown Error Elaboration
16686 - Cylinder 2 Misfire Detected
92-00 - Unknown Error Elaboration
16688 - Cylinder 4 Misfire Detected
93-00 - Unknown Error Elaboration
16690 - Cylinder 6 Misfire Detected
93-00 - Unknown Error Elaboration
16684 - Random/Multiple Cylinder Misfire Detected
93-00 - Unknown Error Elaboration

I have a bad front right abs sensor which explains the 18014. I have also been pulling code 16525 but it has not seemed to effect anything. With all the misfire's detected I did a search and found it could be Spark plugs or coil pack. Last summer I replaced my spark plugs with Denso iraidum for the NOS.

Last night- Cleaned codes when I got home... waited an hr, then took the a4 for a spin around the block with my laptop,,, first 5 mins no dtcs.... Then the usual 2 dtcs hit:

16525 - O2S B1 S2: Heating Circuit Failure
95-00 - Unknown Error Elaboration

18014 - Rough Road/Engine Torque Signal from ABS Cont. Electrical Malfunction
71-00 - Cylinder 4.

At this point the car was driving fine... so I said lets take it to the parkway.... Took the car to 85 mph and it was driving with lots of power nice and smooth. On the way home after I exit the parkway all of a sudden (Approx 15-20 mins after driving) my car starts running like crap and so I hit check codes and what do I get?

17514 - O2S: B2 S1: Voltage too Low / Air Leak
95-00 - Unknown Error Elaboration
It seems as though driving at high speeds (65+) for over 10 mins seems to causes my car to run like crap and this code (which isn't good cuz its my only source of transportation to work !). My question is do I have a bad MAF or 2 bad o2 sensors?

Any advice greatly appreciated.<ul><li><a href="http://pictureposter.audiworld.com/70143/p2170003.jpg">another pic</a></li></ul>

Mr.D-'97 A4q 12v

Check your O2 sensors to make sure the are not loose. How many miles are on them?

MM120

*Ducks* Mine have over 194k miles, &amp; I still haven't thrown a code yet.............knock on wood.

Mr.D-'97 A4q 12v

Now that you said that you can clear your O2 code tomorrow. :-p

jazz_12v

105K ,,,i found the article on cleaning MAF but it seems different cuz i don't have an airbox. do you think this will help?

MM120

Don't jinx me!!!!!!!!

Mr.D-'97 A4q 12v

and you should see an improvement in the way your car runs. Cleaning the MAF won't hurt either.

I wonder if those misfire codes were left over from a previous event, possibly from your nitrous. I don't think all codes trigger the CEL (I could be wrong).

jazz_12v

i think i'm going to replace the 2 o2 sensors and abs sensor. Then i'll have to get over missing my lovely CEL

Mr.D-'97 A4q 12v

they should only be spliced one way. <a href="https://forums.audiworld.com/12v/msgs/8496.phtml">Here is a link to a writeup that UrS4 did.</a>

I got the sensors from <a href="http://www.shokan.com/">Shokan</a> for about $50 a piece.

<a href="https://forums.audiworld.com/12v/msgs/9620.phtml">And here is a link to my post from when I changed mine (with pics).</a>

Hope this helps.

snowman '92 100

lol