Engine vibration under acceleration.

[w4rdy1985]

I've been to look at a 172 cup today.
The car has two problems which I have questions about.
1. Under hard acceleration there is a horrendous knocking/ vibrating sort of sound.
I have heard before this can be engine mount failure or the need to bring the engine forward on the upper mount.
What is the likeliness of it being a mount if I took a gamble and bought this car? Is there anything else more serious/expensive this could be?

Does anyone know of an engine mount vibration video that I could compare the noise too?

2. The airbag and service light were on the first time I started the car but the next time I started it they had gone.
Is this the wiring under the seats? Or squib ring?
What is the most expensive outcome of these dash lights?
I don't want to buy a car and have to spend a fortune on rectification but the car seemed pretty decent elsewhere and certainly seemed a quick one.
All help and advice appreciated!
Cheers

 

[DaveDreads]

The knocking under load is more than likely a worn dog bone mount, it's very common, £40 quid will get you polybushes to put in it that will solve the problem.

The airbag light could just be a dodgy connector under one of the seats, i've got this atm.

 

[w4rdy1985]

The knocking under load is more than likely a worn dog bone mount, it's very common, £40 quid will get you polybushes to put in it that will solve the problem.

The airbag light could just be a dodgy connector under one of the seats, i've got this atm.

Ok thanks, this is what I thought!
I'd still like to know from anyone if these could potentially be more costly issues.
Thanks

 

[w4rdy1985]

Are there any videos or sound clips anyone knows of, of this problem?
So I can be sure that this is the issue?
Thanks