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Hi all, This is my First post here but I am member of Briskoda (Skoda forum)

So a mate bought a 2002 VW beetle 1.6 SR for £400, no surprise it has some faults. he bought it as it was from a friend of his family, and his 2001 VW Polo was always on the brink of dying, due to the fact that he didnt maintain it properly. Anyway this beetle, The EML is on along with the ESP light.

The initial VCDS scan showed:

Mileage: 173170km/107602miles
-------------------------------------------------------------------------------
Address 01: Engine Labels: None
Part No: 06A 906 033 AK
Component: SIMOS33 1.6l 2V 00HS4039
Coding: 00031
Shop #: WSC 00066
VCID: 68D59ACD08F0C15E337-5140

3 Faults Found:
16487 - Mass Air Flow Sensor (G70)
P0103 - 35-10 - Signal too High - Intermittent
17811 - EGR System
P1403 - 35-10 - Regulation Deviation - Intermittent
16497 - Intake Air Temp. Sensor (G42)
P0113 - 35-10 - Signal too High - Intermittent
Readiness: 0010 1001

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Address 03: ABS Brakes Labels: 1C0-907-37x-ESP-F.lbl
Part No: 1C0 907 379 G
Component: ESP FRONT MK60 0101
Coding: 0011266
Shop #: WSC 00066 000 00000
VCID: 2E592CD5BA945F6E39B-5122

1 Fault Found:
01314 - Engine Control Module
013 - Check DTC Memory

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Address 15: Airbags Labels: 6Q0-909-605-VW5.lbl
Part No: 1C0 909 605 A
Component: 1T AIRBAG VW51 0D 0004
Coding: 12628
Shop #: WSC 00066
VCID: 2241C8E5AE4CEB0EAD3-4AF6

1 Fault Found:
00532 - Supply Voltage B+
07-10 - Signal too Low - Intermittent

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Address 17: Instruments Labels: 1C0-920-x4x.lbl
Part No: 1C0 920 920 C
Component: KOMBI+WEGFAHRS. M73 V08
Coding: 01412
Shop #: WSC 00000
VCID: 1D3BFB199732D4F6901-4AF6


3 Faults Found:
01039 - Coolant Temperature Sensor (G2)
30-10 - Open or Short to Plus - Intermittent
00562 - Sensor for Oil Level/Temperature (G266)
29-10 - Short to Ground - Intermittent
00562 - Sensor for Oil Level/Temperature (G266)
27-10 - Implausible Signal - Intermittent

-------------------------------------------------------------------------------

cleared those faults, I reckon some of them were caused by the battery going flat. So in the end I took it for a drive, and then re-scanned and these faults persisted:

Mileage: 173220km/107633miles
-------------------------------------------------------------------------------
Address 01: Engine Labels: None
Part No: 06A 906 033 AK
Component: SIMOS33 1.6l 2V 00HS4039
Coding: 00031
Shop #: WSC 00066
VCID: 68D59ACD08F0C15E337-5122

3 Faults Found:
17811 - EGR System
P1403 - 35-00 - Regulation Deviation
16486 - Mass Air Flow Sensor (G70)
P0102 - 35-00 - Signal too Low
16497 - Intake Air Temp. Sensor (G42)
P0113 - 35-10 - Signal too High - Intermittent
Readiness: 1010 1001

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 1C0-907-37x-ESP-F.lbl
Part No: 1C0 907 379 G
Component: ESP FRONT MK60 0101
Coding: 0011266
Shop #: WSC 00066 000 00000
VCID: 2E592CD5BA945F6E39B-5140

1 Fault Found:
01314 - Engine Control Module
013 - Check DTC Memory

-------------------------------------------------------------------------------

So it indicated that the MAF/IAT sensors were faulty. As these are both in the same housing. Took it out, it looked fairly new, and i gave it a clean in electrical cleaner. The Fault persisted. I also measured approximately 3000 Ohms across 2 of the pins, and 4700 ohms across another two (4 pin sensor)

Ross-Tech says with both that if the sensor is ok, then there is an issue with the loom. Is there a way to confirm this? Someone has had a look at the loom before (left yellow PVC tape around the wires) and i found one had a nick in the insulation, going to bare copper, but the conductor was ok with no breaks or corrosion So I re-taped it and set it all back up as it was.

Thing i dont understand is as well as VCDS, i also have a cheap ebay generic fault code reader. This reader can also measure real time data, which showed a reading for the MAF (in ibs/min) and also showed an Intake Air Temp of around 69 degrees Fahrenheit. I unplugged the sensor and the readings dropped to 0.00 Ibs/min and -40 Deg Fahrenheit, which indicated to me that the sensor was infact working as intended.


Just after a 2nd opinion really, any other suggestions than replacing the wiring loom?
 

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You may have looked at these; thought I put them up anyway:

17811/P1403/005123 - Ross-Tech Wiki

16487/P0103/000259 - Ross-Tech Wiki

16497/P0113/000275 - Ross-Tech Wiki

01314 - Ross-Tech Wiki

A number of the above issues; mention possible wiring problems and you mentioned "yellow tape" on the wiring loom; just to let you know, at a VW dealer/service dept., they put "yellow tape" on the wiring loom, to indicate a wiring repair has been done there (intentionally). This is a common "thread"; in everyone of the trouble code definitions. So, I would check the areas with this tape; to see if there is any damage or to see if the repair was done correctly or if there is any problems in that area. Every component; is mentioned as having issues possibly with wiring faults, I find it hard to believe that all have failed... it points to possible wiring problems, imho. While I am not helping in a super specifc way; I am seeing wiring issues as a common theme, testing the wiring to each area with a persistent fault, would make sense. The ECU fault; couldn't hurt to check the wiring for problems, to the ECU, pull plug look at the contacts/plug (melted wiring/plug/bent pins etc.) and plug back in, see if that makes a difference (if dirty or corroded; possibly, clean with electrical contact cleaner, this goes for other plugs as well). Everything look normal; was the ecu plugged in securely, any damage? etc.

A hard reset; couldn't hurt either: remove positive and negative cables from the battery, connect for 30 seconds and then reattach. Run the car and scan again, see what codes come back. Persistent codes; would indicate "hard" failure and would indicate more troubleshooting in that area needed. Testing wiring as per vw service manual and getting wiring diagram with ecm pin outs; would be helpful. As with so many things electrical; they can be intermittent and could have been working fine, when you did the tests and then cut out at certain times.
 
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