howdy howdy, i just bought myself a obd scanner and tested it out on my 99 a4 2.8 and it shows 17 codes. eventually id like to have it all fixed up but i only have so much money to work with right now im going to list the codes and if you guys could just help me with which ones or more important than others thanks.
p0300
p0411
p0455
p0301
p0303
p0302
p0160
p1435
p1421
p1425
p1472
p1196
p1197
p1198
p1199
p0140
p0134
p0154
p1300

quite the laundry list eh?

 

I only know a few off the top of my head...but I'm going to say right off the bat your car runs rough for sure....misfires, SAI pump codes, o2 Sensor codes, etc...you need to either google all the codes, or get a VAG COM and start somewhere...clear all your codes, then start your car back up, let it run for a few, then see which codes come back right away, and I would start there. A lot of your codes could be caused by other codes and failures...so, if you find a solution for one main code, it may clear up some others with it.

 

thanks man for the response,i know all the codes my scanner reads them and i have cleared them all and those all came back, i have replaced the sparkplugs the other day and i still have 3 cylinder misfires. im gona get a wireset but there so damn expensive.thanks buddy again

 

bumpin...

 

I have my Bentley manual at home. I could get you the codes Friday if you like.

 

thanks but i know the codes already, thats not my problem. my problem is im tring to figure out where to start on this list, i did the spark plugs and have a new wireset on the way.

 

Since you know where your misfires are, just move the wires around to test if it follows with the wires first before buying a new set.

I would also start by unplugging the MAF sensor and see what happens. If it is working correctly, it should run even worse, or stall (mine did) or if there is NO change at all, the MAF is either really dirty or clogged and you can clean it up.

Look and see if you have any vaccum leaks, or just go buy some new vaccum hose, it's not very expensive and replace all the hoses on top. Look at your crank case breather hose tube, goes from one side of the valve cover to the other and see if it is broken or clogged...look at your air intake hoses, from the air filter over, if there's a leak in one of those, it will suck up fumes and make the MAF run badly....

 

Check all your fuses. Here's a link to a VW with a 1.8 with some of your same codes...
VWVortex.com - help with some codes please

 

awesome thank you! ill get out and do all that tomorrow and see what i can figure out. ill post back tomorrow what i figure out, thanks again

 

alrighty so i replaced the wires, did most of the vacuum hoses, the ones i didnt change i inspected and they seemed pretty good, no cracked hoses by the air cleaner and the maf is fine, the only codes i have left so far, only ran it for a couple minutes after i cleared the codes, are
p1435-Secondary air injection (AIR) pump relay - short to ground
p1421-Secondary air injection (AIR) valve/solenoid - short to ground
p1425-Evaporative emission (EVAP) canister purge valve - short to ground
p1472- EVAP emission control system LDP short to ground
would any of these be as simple as replacing a relay?