1998 Audi A4 - Answered Questions & Fixed issues

The serpentine belt routing diagram for 1998 Audi A4 Quattro 2.8 liters V6 engine:



CS = Crankshaft
F = Fan pulley
Gen = Alternator
T = Tensioner pulley
AC = Air Conditioning
PAS = Power Assisted Steering

Schwaben makes a great 3-piece pry bar and cam seal removal tool. I have found many uses for mine. https://www.pelicanparts.com/More_Info/PELPB3PCS.htm?pn=PEL-PB-3PCS&gclid=EAIaIQobChMIjs2nvI2h4gIVHLjACh1-ggjyEAQYASABEgIUQvD_BwE

If it will crank over, it can be started. Only IF it is getting fire to the plugs AND fuel to the cylinders. What you can do is, have a spark plug wrench ready to remove the easiest to get to spark plug, crank ti over a few times like you'r trying to start it, shut the switch off and pull the spark plug quickly. IF the tip of the plug at the electrode is wet, it's getting fuel to start. Fuel delivery is fine. Now, before you put the spark plug back in the head, put the plug on the end of it's consecutive plug wire end, hold the electrode on the engine to ground it and have someone crank the engine over. If you see a spark happen at the electrode, your getting fire also. But for it to NOT start, one of the two have to be missing. If both are present, and still no start, then, it could be that the cold start mode from the computer is not engaging and not enough fuel to the cylinders. To check that, remove the wire plugged onto the temperature sensor and ground it to the block. Crank the engine and see will it start. If it does, you have a faulty temperature sending unit/sensor. You've now tried as much as would be any required start procedure and it should be running.

Check this website you find there fuse box diagram and description for Audi A4 A4 CARKNOWLEDGE

I tried the DIY service and repair manuals from a website and it actually helped me repair transmission problem in my ford explorer. it wont move forward or reverse, engine is good both solenoids for forward and reverse work. I don't have much technical knowledge but I just followed it step-wise, and works perfect! got it from www.reliable-store.com

Hi You may have to replace the system pressure cap. Also check to see if the system is under pressure soon after starting the engine if it is it could be Head Gasket, my money is on the anti-free reacting with the rad cap (for your sake), have a look at the over flow hose to see if the end is whet after a short drive. Let me know how you get on and any more info that would help me this end. Regards David

The brown wire from the downstream sensors is broken or otherwise not connected to the computer. Check for damage to the wire.

Was the brake line removed ? There is no reason a brake line needs to be replaced unless the line was broken or damaged. One way to check if your car has sensors, is to look for a harness that runs and is secured on the strut. Also check the hub, there is usually a slot in the back where the sensor is mounted. Some vehicles come without brake sensors, best thing to do is call local dealer, supply them with your VIN and ask them if it comes with sensors. What were the repairs done to your brakes ? What is the problem after the repair was done ? You may only need to bleed the complete system if calipers were replaced.

Is this a diesel?

You checked the fuel pump for power and verified there is no power to the pump? Remember the pump only runs for about 1 second unless the engine starts.

Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem. Audi Service Repair Workshop Manuals

You need to take the car into the dealer or a well equipped repair shop and have the control module scanned for faults. This takes a very special tool, this is not the little $35 code readers that parts stores sell.

Which one? There are typically more than one cooling fan.

William, It appears to be a fault with the door contact switch. 01361 Close switch for ATW Short to earth 1) - Short to earth in the wiring. - Door contact switch -F2 defective Check the attached links, videos and forums on this issue. "I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info." You CAN replace the Door Open micro switch in the door latch AudiWorld... http://www.audi-sport.net/xf/threads/driver-door-contact-switch.65995 Audi A6 4B C5 Driver door lock microswitch Audi A6 door panal removal

code p 1625 refers to CAN databus, TCM--incorrect signal===causes --TCM trouble code/s stored---TCM incorrectly coded---wiring---matching resistor in ECM I don't have a listing for code p 1749 but codes 1748 and 1750 are concerned with TCM defective and voltage supply low so after you check the wiring and connections form the transmission you have 2 options use a known good ECM to replace yours ( will eliminate any ECM faults) and/or replace the TCM module on the transmission

..DIESEL ENGINES THE OIL PRESSURE SENSOR IS SCREWED INTO THE OIL FILTER HOUSING ASWELL.PRISE OUT THE CAPS,UNDO THE NUTS AND REMOVE THE PLASTIC COVER ON TOP OF ENGINE.REMOVE THE INSULATION BENEATH COVER (WHERE FITTED).DISCONNECT WIRING PLUG FROM SENSOR AND UNSCREW......BE PREPARED FOR OIL SPILLAGE.Hope this helps you out, Good luck

If no noises from engine it's likely possible that the oil pressure switch went bad. If you don't change you oil often there's a possibility that there may be sludge build up and possibly clogging the pick up. If you go more than the recommended amount of mileage/time between oil changes I would recommend an engine flush.

YES BUT ONLY IF THE SWITCH IS NOT A FAULTY ONE!!

Probably just dealer getting their hands in your pockets for an inspection that is set to a particular mileage amount (like 150,000 miles) ? :) To know for sure the code get a code scanner. For about the price of an inspection or code read (though some garages will do for free) get you own code reader. :) How to reset on a VW- ("Volkswagen VW (with digital Odometer) The code on the mileage display when you start the car will read "IN01", "IN02" or similar. To clear this, use the following procedure (this should work on any VW with a digital odometer): With the key out of the ignition press the odometer reset button and hold it down Turn the ignition on (warning lights come on) wait about 10-15 sec until most or the lights are off (still pressing odometer reset button) Turn ignition off (button still pressed) and remove the keyRelease reset button Interval should now be reset. If this is not the case, repeat the above procedure") For your car instructions for reset (IF YOU THINK ITS JUST A $ERVICE CALL PLOY!) Audi A4 & A6 - 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Turn off the ignitionPress and hold the button on the left side of the display while turning the ignition on - Service OIL will be displayed Pull out the button on the right side of the display until the service prompt is cleared The display should now read ---- If the above procedure does not work, below is an alternative procedure: With the ignition off, push the right button Turn the ignition on and then pull the left button Turn off ignition Kind Regards, Scott Thread in02 fault code Service Reset Advice 078 UK ANYCAR FAULT CODE READER ERASER SCAN TOOL OBD2

Either head gasket blown or head warped! Has the car overheated?