Engine, ABS and Transmission Codes

[steamship]

Had this posted under a D2 Transmission thread, but decided to repost here.

The car (3.7 40v) got gas conversion done in November. In December, had it checked after 1,000 mile and they cleaned the MAF sensor. Had been having issues with it throwing up both ABS and Traction control lights on dash. When these were on, moving gear lever into Drive sometimes gave a small 'thump'. Also experienced issues with stalls when both lights on and slowing at junctions.

Recently had timing belt, water pump, thermostat, pulleys, etc changed. I replaced most of the vacuum hoses that I could manage, especially those that had shown signs of wear and tear. Also had a new MAF sensor and another ABS pump and controller fitted (from A8parts) as was getting a G201 sensor error. Looking back through all my log files, this G201 error had appeared before (although intermittently). Lambda sensors were checked and working. Since getting car back, it is still throwing the same errors as before. Car went for MOT last week, and luckily for me, it behaved itself during that time.

These are the three sets of errors I'm currently getting:

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Address 01: Engine Labels: None
Part No: 4D0 907 558 AB
Component: 3.7L V8/5V G 0002
Coding: 11753
Shop #: WSC 23143
VCID: 6DDBD76D278ADF1
WAUZZZ4D92N002072 AUZ7Z0A1855153

10 Faults Found:
17530 - Oxygen (Lambda) Sensor Heating; B2 S2
P1122 - 35-00 - Open Circuit
17831 - Secondary Air Injection System; Bank 1
P1423 - 35-00 - Insufficient Flow
17819 - Secondary Air Injection System; Bank 2
P1411 - 35-00 - Insufficient Flow
17548 - Oxygen (Lambda) Sensor; B2 S2
P1140 - 35-00 - Internal Resistance too High
17521 - Oxygen (Lambda) Sensor; B1 S1
P1113 - 35-10 - Internal Resistance too High - Intermittent
17535 - Fuel Trim; Bank 1 (Mult)
P1127 - 35-00 - System too Rich
17537 - Fuel Trim; Bank 2 (Mult)
P1129 - 35-00 - System too Rich
16485 - Mass Air Flow Sensor (G70)
P0101 - 35-00 - Implausible Signal
17545 - Fuel Trim: Bank 1 (Add)
P1137 - 35-10 - System too Rich - Intermittent
17547 - Fuel Trim: Bank 2 (Add)
P1139 - 35-10 - System too Rich - Intermittent
Readiness: 0010 0101

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Address 03: ABS Brakes Labels: 8D0-907-389.lbl
Part No: 4D0 907 389 E
Component: ABS/ESP allrad D56
Coding: 08397
Shop #: WSC 02313
VCID: 31630B1DFB327B1

3 Faults Found:
01435 - Brake Pressure Sensor 1 (G201)
48-00 - Supply Voltage
01423 - Lateral Acceleration Sensor (G200)
57-10 - Electric Circuit Failure - Intermittent
18265 - Load Signal
P1857 - 35-00 - Error Message from ECU

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Address 02: Auto Trans Labels: 01V-927-156.lbl
Part No: 4D0 927 156 DT
Component: AG5 01V 3.7l5V RdW 1920
Coding: 00001
Shop #: WSC 00000
VCID: 7EF9E0217AEC549

1 Fault Found:
18265 - Load Signal
P1857 - 35-00 - Error Message from ECU

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On my previous post, recommendation was to get MAF changed as a starter. This was done prior to getting other work done, but it is still throwing the MAF error and other codes.

The G200 error is a new one I've never seen before.

Is it possible that some of these could be due to not enough power from the battery? Reason for asking that is that I did the scan earlier, cleared the codes and did another scan. I then tried starting the car and it wouldn't turn over. I ended up using a booster pack to start it. I had been out yesterday in the car during daylight and did around 20 mile. The car also sits out all the time. I also came across a post somewhere about another VAG car saying it was because the alternator was on the way out.

I can't really afford to keep fitting new parts to the car in the hope that something may fix it. As it is, I now have a spare MAF sensor and ABS pump/controller. As even, any help would be much appreciated, and what if any other checks can I run that would help diagnose the problem?