Hi all,

 

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. These engines have a MAF sensor instead of a MAP sensor.

 

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

 

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

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

 

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

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

 

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

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. However 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 aswell 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? The ECU is placed under the dashboard and from what i can see, is a PITA to get to.

MAF is a common problem on Beetles, we have had a few older ones and pretty much all of them have had MAF problems, usually best to replace them, but get a genuine Bosch one as cheaper ones are useless, I tried a cheap generic one once and it just made it run like a bag of nails, put a Bosch on and it worked a treat, these can either be got from the dealer on an exchange basis or any motor factors will do one.

 

The Beetles are a good car, my wife loves them, she has had a few and despite the quirky looks and them being based on a mk4 Golf which is obviously old hat technology now, they are quite reliable cars.

 

Its also worth changing the temp sensor, as they can fail quite often, do that as well and it will prevent any problems.

 

Good luck with it, and at £400 sounds like a bargain!

 

Check for rust in the gutters on the roof, they can sometimes bubble under the insert strip, if it is, then if it has a VW service history then pop to a dealer and they have the ability to repair and respray that under warranty.

 

Well unfortunately the MAF was swapped to no avail! :(

 

although it wasnt new, it was with a known working MAF.

 

 

So it does appear to be the loom as there is nothing else it could be (which comes to mind)

 

thanks for the reply.