CHECK ENGINE LIGHT WENT ON...

Quattromatt · 09-07-2003, 08:15 AM

I have an 99.5'A41.8T. I installed the HKS intake system, APR chip, and TurboXS BPV. After I installed the intake my check engine went on. I got a The vag-com software and ran it and cleared the light. It obviously went on again! Is there a way to keep it off. Is there a way to reprogram the ecu to know that there is more air coming in? Is there a way to adjust the air/fuel ratio?

RKA · 09-07-2003, 08:18 AM

What code came up when you scanned the codes? You have a problem, which needs to be addressed...but we have NO idea what the problem is, unless you give us the code (or search the archives to find out for yourself).

AudiAddict B7 · 09-07-2003, 08:19 AM

~~Mat Indukts Lambos~~ · 09-07-2003, 09:29 AM

From what I've seen & heard, the larger intake can change the flow of air through the MAF enough to upset the reading significantly.

Also, the oil used in aftermarket intake filters(K&N, HKS, etc.) can get pulled in with the air, get onto the heated portion of the MAF sensor, and burn onto it, causing the obvious problems.

There's got to be a solution though, otherwise why would they sell it?

Might be jumping to conclusions, what's the DTC's?

Yippers® · 09-07-2003, 09:36 AM

removed it from the airbox and installed it in the HKS assembly. The wires running up to the MAS are very delicate and don't tolerate flexing very well. Make sure they are well supported, have sufficent strain relief and are well tied down.

BOOSTD · 09-07-2003, 10:04 AM

http://forums.audiworld.com/a4/msgs/1751494.phtml

RKA · 09-07-2003, 10:06 AM

Rack 'em Willie · 09-07-2003, 11:02 AM

RedBlackYellow · 09-07-2003, 11:40 AM

1.8TQ99.5 · 09-07-2003, 01:10 PM

This is a stab in the dark, of course, but on my 99.5 1.8T quattro the dealer replaced it after I complained about the CEL coming on and losing a bit of power momentarily. This was at about 50K mi.

09-07-2003, 08:15 AM	#1
Quattromatt Junior Member Account #: 61775 Join Date: Sep 2003 Posts: 1,691	CHECK ENGINE LIGHT WENT ON... I have an 99.5'A41.8T. I installed the HKS intake system, APR chip, and TurboXS BPV. After I installed the intake my check engine went on. I got a The vag-com software and ran it and cleared the light. It obviously went on again! Is there a way to keep it off. Is there a way to reprogram the ecu to know that there is more air coming in? Is there a way to adjust the air/fuel ratio? __________________ 2000 S4 APR Stage 2+ mods:never enough Dyno 4/22/06 93oct. 270whp 335wtq <RIP - 1999.5 A4 1.8T Quattro> ********************** <aim id: gsrmatt13> http://cgi6.ebay.com/ws/eBayISAPI.dl...3&since=-1

09-07-2003, 08:18 AM	#2
RKA Member Account #: 2062 Join Date: Mar 2000 Posts: 67,038	If you put black electrical tape over the check engine light, it won't come on again. What code came up when you scanned the codes? You have a problem, which needs to be addressed...but we have NO idea what the problem is, unless you give us the code (or search the archives to find out for yourself). __________________ 2005.5 A4 Avant 2.0T Quattro 6MT APR 91/93/100 \| APR Exhaust \| 19" BBS RS-GT's \| Carbonio \| Hotchkis \| Partridge-in-a-pear-tree Others: 2006 TL on the block 2001 S4 sold 2000 A4 sold * September 11th, 2001 - Never Forget *

09-07-2003, 08:19 AM	#3
AudiAddict B7 Junior Member Account #: 32794 Join Date: Feb 2002 Posts: 1,443	Did you actually read the DTC to see what the problem is? __________________ 07 A4 2.0T QM Prem, Conv, Cold, Tech, Xenons, B-Tooth GONE: 06 A4 2.0T QM GONE: 99.5 1.8TQ APR SIII, Milltek Exhaust, Spec III clutch, H&R/Bilsteins, Strat Short Shifter, A8 Rotors + Hawk HPS pads XM Radio, Infinity Components, Kenwood Subs, S4 HID's, Cellport hands free, Phatnoise.

09-07-2003, 09:29 AM	#4
~~Mat Indukts Lambos~~ Banned Account #: 54525 Join Date: Apr 2003 Posts: 5,753	Ditto on what RKA said below. Sounds like your HKS intake is causing problems.... From what I've seen & heard, the larger intake can change the flow of air through the MAF enough to upset the reading significantly. Also, the oil used in aftermarket intake filters(K&N, HKS, etc.) can get pulled in with the air, get onto the heated portion of the MAF sensor, and burn onto it, causing the obvious problems. There's got to be a solution though, otherwise why would they sell it? Might be jumping to conclusions, what's the DTC's?

09-07-2003, 09:36 AM	#5
Yippers® Member Account #: 19399 Join Date: May 2001 Posts: 17,328	Check your connection on the MAS and that you haven't broken a MAS wire in screwing with it when you removed it from the airbox and installed it in the HKS assembly. The wires running up to the MAS are very delicate and don't tolerate flexing very well. Make sure they are well supported, have sufficent strain relief and are well tied down. __________________

09-07-2003, 10:04 AM	#6
BOOSTD Elder Member Account #: 6443 Join Date: Jun 2000 Posts: 28,116	THEIF!!!!! http://forums.audiworld.com/a4/msgs/1751494.phtml __________________ Please read.

09-07-2003, 10:06 AM	#7
RKA Member Account #: 2062 Join Date: Mar 2000 Posts: 67,038	=) __________________ 2005.5 A4 Avant 2.0T Quattro 6MT APR 91/93/100 \| APR Exhaust \| 19" BBS RS-GT's \| Carbonio \| Hotchkis \| Partridge-in-a-pear-tree Others: 2006 TL on the block 2001 S4 sold 2000 A4 sold * September 11th, 2001 - Never Forget *

09-07-2003, 11:02 AM	#8
Rack 'em Willie Member Account #: 34084 Join Date: Mar 2002 Posts: 10,452	It might be your BOV. They are known to cause problems. __________________

09-07-2003, 11:40 AM	#9
RedBlackYellow AudiWorld Super User Account #: 18864 Join Date: Apr 2001 Posts: 6,758	blondes should be kept away from electrical tape, just for the record. __________________ 12 Rings 2004 Allroad 4.2 Blue, Tiptronic 2001 Allroad 2.7T Metallic Silver, Tiptronic 1998 Cabriolet V6 Blue, Auto

09-07-2003, 01:10 PM	#10
1.8TQ99.5 Member Account #: 1768 Join Date: Mar 2000 Posts: 13,629	Just reviewed my entire service history, and my by-pass valve was once replaced due to a CEL This is a stab in the dark, of course, but on my 99.5 1.8T quattro the dealer replaced it after I complained about the CEL coming on and losing a bit of power momentarily. This was at about 50K mi. __________________ A41.8T99.5quattrotipbrilliantblackapr91octaneh&rraces4bilsteinsbaileydv30k&nfilterawecenterventboostgauges4wheellinerRS4grillGentexNVSautodimmingmirror

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