Worrying Behaviour!

[steamship]

Was out today for a 50 mile trip. Country roads mainly, so never got about 50mph. Both traction control and ABS lights came on again (as mentioned in another thread), but this time stayed on for around 30 miles (previously only for a few seconds).

More to the point, experienced two other issues which has me seriously worried. The first is a small thump when putting the car into Drive. It doesn't happen in any other gear.

The second was a stall. Was driving uphill towards a roundabout and just eased up on the accelerator. Was doing around 10mph as I reached the roundabout, which by now was clear, and I started to accelerate. Got a couple of car lengths and the car died. Put in Neutral, restarted, into Drive, and away again.

When I got home, I ran a scan on it, and have included the relevant bits below.

-------------------------------------------------------------------------------
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:
17521 - Oxygen (Lambda) Sensor; B1 S1
P1113 - 35-10 - Internal Resistance too High - Intermittent
17831 - Secondary Air Injection System; Bank 1
P1423 - 35-00 - Insufficient Flow
17819 - Secondary Air Injection System; Bank 2
P1411 - 35-00 - Insufficient Flow
17536 - Fuel Trim; Bank 1 (Mult)
P1128 - 35-10 - System too Lean - Intermittent
17530 - Oxygen (Lambda) Sensor Heating; B2 S2
P1122 - 35-00 - Open Circuit
17548 - Oxygen (Lambda) Sensor; B2 S2
P1140 - 35-00 - Internal Resistance too High
17538 - Fuel Trim; Bank 2 (Mult)
P1130 - 35-10 - System too Lean - Intermittent
16485 - Mass Air Flow Sensor (G70)
P0101 - 35-00 - Implausible Signal
17545 - Fuel Trim: Bank 1 (Add)
P1137 - 35-00 - System too Rich
17547 - Fuel Trim: Bank 2 (Add)
P1139 - 35-00 - System too Rich
Readiness: 0000 0001

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

2 Faults Found:
01119 - Gear Recognition Signal
35-10 - - - Intermittent
18265 - Load Signal
P1857 - 35-00 - Error Message from ECU

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

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

I should point out that the car runs on LPG as well. I cleared the codes and the rescan was clear.

I haven't taken the car out for a drive, but just moving it in the drive, there isn't any thump anymore. The traction control and ESP lights have also gone out.

Now, I've been reading through some other posts on similar symptoms and error codes, and none of it makes for good reading.

I'm hoping that all the engine ones are as a result of a faulty thermostat having an effect on how it runs on LPG, and throwing up those errors. They may also be accountable for the stall. I'm buying all the necessary parts for getting the belts done, so will be getting the water pump and thermostat done as well.

The question is, what could be causing the 'thump', which disappears when the codes were cleared? I'm hoping that it isn't the gearbox, as I can't afford a job like that.