So I have this Octavia 3, 2.0TDI, It has following errors:

U041600: ESP implausible signal
U042800: Invalid data received from steering angle sensor module
U350200: Control module Input power "A" circuit high

The car sometimes shudders and stalls. Or cranks but does not start. 
If I move the 645 relay it starts up. This issue comes up on about 25% of starts
Following steps were taken but did not find a solution.

Swapped the relay with new one. 

Checked fusebox pins, the relay and connections are not loose at all
checked wiring from relay to ECU

Any idea what could cause this? Or further diagnosis steps?

 

 

 

 

 

 

 

Any third party accessories put into the car (such as dash-cam)?

No accessories. Car is fully stock

2 hours ago, tanmay324 said:

Checked fusebox pins, the relay and connections are not loose at all
checked wiring from relay to ECU

Any idea what could cause this

 

The female receptacles for the spade terminals on the relay plate not gripping the relay terminals.

 

I dont know the relay plate construction but if there are any soldered junctions then a dry joint would be probable, if solid tracks then possibly corrosion from water ingress.

Have checked that before. Tried tightening it with a piece of copper also. Will try to jump the wire from connector directly to the relay now. No corrosion observed