Various faults and symptoms - car not too happy! Any help appreciated

Hi,

I've recently had a few issues with my Leon Cupra T (180).

The VAGCOM scan threw up this log:

VAG-COM Version: Release 311.2-N


Chassis Type: 1M - Seat Leon
Scan: 01,02,03,08,15,17,19,22,35,46,56

Address 01 -------------------------------------------------------
Controller: 06A 906 032 HN
Component: 1.8L R4/5VT 0001
Coding: 11510
Shop #: WSC 06441
VSSZZZ1MZ2R007729 SEZ7Z0A1247039
5 Faults Found:
16795 - Secondary Air Injection System: Incorrect Flow Detected
P0411 - 35-00 - -
17544 - Fuel Trim: Bank 1 (Add): System too Lean
P1136 - 35-10 - - - Intermittent
16885 - Vehicle Speed Sensor: Implausible Signal
P0501 - 35-10 - - - Intermittent
16955 - Brake Switch (F): Implausible Signal
P0571 - 35-10 - - - Intermittent
16891 - Idle Control System RPM Higher than Expected.
P0507 - 35-10 - - - Intermittent
Readiness: 0000 0000

Address 03 -------------------------------------------------------
Controller: 1C0 907 379 D
Component: ASR FRONT MK60 0103
Coding: 0022017
Shop #: WSC 00001
No fault code found.

Address 08 -------------------------------------------------------
Controller: 1M0 820 043 D
Note: Excessive Comm Errors

Skipping Address 15-Airbags

Address 17 -------------------------------------------------------
Controller: 1M0 920 902 C
Component: KOMBI+WEGFAHRSP VDO V01
Coding: 05424
Shop #: WSC 00000
VSSZZZ1MZ2R007729 SEZ7Z0A1247039
No fault code found.

Address 19 -------------------------------------------------------
Controller: 6N0 909 901
Component: Gateway K<->CAN 0001
Coding: 00006
Shop #: WSC 06441
No fault code found.

Address 46 -------------------------------------------------------
Controller: 1C0 959 799 F
Component: 3M Komfortgerát HLO 0003
Coding: 00259
Shop #: WSC 06441
1 Fault Found:
00849 - S-contact at Ignition/Starter Switch (D)
25-00 - Unknown Switch Condition

End -------------------------------------------------------


The problems I'm experiencing are:

Intermittent loss of speedometer, when this happens the car feels a bit choppy and not as smooth as usual. The fuel gauge goes a bit crazy every now and again, often when turning sharply it suddenly drops to near zero triggering the light and beep.

I've been getting sudden loss of power where I lose all power for a second or two, a little bit worrying as it's happened at really bad moments! If I come off the accelerator or dip the clutch power usually returns.

The final thing is sometime when I try to start it, everything goes dead and there's no current at all. I have to pop the bonnet, wiggle the negative battery terminal and all the electrics reset.

Has anyone experienced anything similar relating to the faults and symptoms and can advise what I need to do to tackle these problems?

Thanks very much!

Brake lights are working and the switch is fairly new (well a year or so), would it be likely to be going that soon?

The terminal fits tightly on the battery, it just seems to take a slight movement to cause electrics to come back on. I wondered if it were something to do with the ignition switch fault as it only occurs occasionally when I start ignition.

Can anyone confirm the front passenger side abs sensor for the speedo?

I did read that about the G22 sensor, can't find any named that for sale on Euro car parts or Ebay, does it have a more common name? Anyone able to post a link?