fault codes vagcom

[Audidave]

A mate of mine has just brought a 2000 b5 avant 1.8 se, he brought it round to me as it was running really rough over 3000 rpm. vaccom flagged up a fault code of a vacum switch that bolts to the front end of the inlet manifold. He ordered and changed the switch, we cleared the code, it was still running as before, new code now "lamba sensor after cat" fitted new (audi) sensor still the same, cleared code now a new code altittude sensor or something (he has borrowed vagcom to save me spending the rest of my life out on the drive!) any one any idea's?

Oh forgot to mention someone had already fitted new front lamba sensor (unknown make) before, it is also throwing on engine management light.

Cheers Dave.

 

[hades-]

have you got the codes ?

 

[Audidave]

Would a maf throw a fault code up or a coil pack?

 

[Audidave]

fault code's so far
lost first one!
16524
18001

 

[hades-]

yes both coil pack and MAF will give codes



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Contents

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• 1 16524/P0140/000320 - Oxygen (Lambda) Sensor B1 S2: No Activity
  • 1.1 Possible Symptoms
  • 1.2 Possible Causes
  • 1.3 Possible Solutions

16524/P0140/000320 - Oxygen (Lambda) Sensor B1 S2: No Activity

Possible Symptoms

• Malfunction Indicator Light (MIL) faulty

Possible Causes

• Wiring/Connectors from/to Oxygen (Lambda) Sensor Bank 1 Sensor 2 faulty
• Oxygen (Lambda) Sensor Bank 1 Sensor 2 faulty

Possible Solutions

• Check Wiring/Connectors from/to Oxygen (Lambda) Sensor Bank 1 Sensor 2
• Check Oxygen (Lambda) Sensor Bank 1 Sensor 2

18001/P1593/005523

From Ross-Tech Wiki


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Contents

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• 1 18001/P1593/005523 - Altitude Adaptation: Signal Out of Tolerance
  • 1.1 Possible Symptoms
  • 1.2 Commentary
  • 1.3 Possible Causes
  • 1.4 Possible Solutions

18001/P1593/005523 - Altitude Adaptation: Signal Out of Tolerance

Possible Symptoms

• Unknown

Commentary

This is one of those fault codes where the ECU knows something is amiss, but cannot pinpoint the cause.
Possible Causes

• MAF sensor (G70) out of tolerance.
• Leak in intake system.
• Throttle position sensors (G187/G188) out of tolerance.

Possible Solutions

• Check MAF/replace MAF Sensor (G70).
• Check intake systems for leaks and repair.
• Check Throttle position sensors (G187/G188).

 

[Audidave]

Can we unplug maf and run it, will this prove anything?

 

[hades-]

well you can try
after you fitted the lamba did you clear the codes ?

 

[Audidave]

yes cleared code each time.
car has misfired all along thinking maf might be cause, can running lean damage lamba sensors? or cat?

 

[Audidave]

now 2 new codes
16486
16514

 

[hades-]

16486/P0102/000258 - Mass Air Flow (MAF) (G70): Signal too Low

Possible Symptoms

• Probably no serious malfunctions
• Loss of power

Possible Causes

• Wiring and/or connections (short circuit?)
• Mass Air Flow (MAF) (G70) defective

Possible Solutions

• Check wiring and connections
• Check / Replace Mass Air Flow (MAF) (G70)

Special Notes

• In MY 1995-2002 (?) in Europe at VW-diesel-cars G70 had the bad reputation of slowly losing his performance, causing loss of power. It's not a matter of defective or breaking down, but it is filthy / dirty (not easy to clean). You can check functionality by making a log in [01-engine], [meas.blocks-08], group 003 (3e

16564/P0180 - Fuel Temperature Sensor A (G81): Signal Too Low

Possible Causes

• Open or short in harness
• Improper harness connection
• Low ambient temperature operation
• G81 damaged
• Controle Module faulty

Retrieved from "16564/P0180 - Ross-Tech Wiki"
Category: Fault Codes

 

[aragorn]

I'd be checking the MAF/Lambda/Sensors have power.

Check all the fuses are good, as most of those devices run off one fuse iirc.

 

[Audidave]

i'm thinking may we have a bad earth or a short in th harness
any thoughts? any one.

 

[Audidave]

fitted new maf and all good!!