2002 Vauxhall Zafira ELX review from UK and Ireland

I have a Zafira Elegance 2.0 DT ELX.

Warning light on dashboard electronically controlled engine, cooling along with immobilizer light.

Car starts OK, but then after approx 1/2 miles lights come on dashboard and the power then goes. Also no revs. Can drive just about under 40mph, and then after a few miles the lights go out and back to normal. Car has now stopped 2 times completely when lights on and managed to get started.

Vauxhall printed error codes present engine speed input from ECU, P0400 critical system malfunction 1. ABS light fault C0035 not present front left wheel sensor + cooling module. No engine rpm signal. Further investigation required.

May require fuel pump/ECU £2502.75 inc vat £752 also may require wheel bearing £330.18 subject to investigation. Vauxhall want another £164 to check.

Other garage can't find fault so could be above. £3k is not worth it due to the car's age. Anyone else had this problem please?

Loved this car till now. Very roomy and good family car, but as the car only 6 years old and only through a third of its engine life, I'm in despair.

Don't want to pay Vauxhall another £164 to still be told the above faults, as it will be wasted money, but stuck to find out 100% what is wrong, as Nationwide Autocentre have looked at it twice and can only assume it's the other parts Vauxhall are stating.