Can i use second hand engine mountains and bushins on my 1996 audi a4 or should i just buy them new

the timing chains are located at the rear of the motor requiring a transmission removal to replace
If the chains need replacing and the guides and tensioners will be close to needing replacement that is an added cost to be considered
ask service agents and accredited service centers who work on Audi how much that procedure costs

Hope you used factory sender. Aftermarket senders have contact problems. Audi updated their senders to gold contacts to improve performance. Moving it by hand may force good contact as opposed top free floating in tank

I’m happy to assist further over the phone at https://www.6ya.com/expert/howard_977676954994c5b2

All 4 wire O2 sensors are compatible in function. The only difference is the plug for the wiring loom.
A B5 A4 and a C4 A6 should have the same plug...

I wouldn't use a second hand O2 sensor though.., always buy new.

right hand side of engine back of head area inside a plastic housing ,1.6 1.8 models with transverse engine ,long ways on engines its on the side ,follow the bottom hose back to engine this is where it is

The re gassing valves are located in the plenum chamber near the brake booster on the high and low pressure pipes. [right rear of engine compartment on right hand drive vehicles. may be opposite side on LHD vehicles.

engine control unit in black plastic box at right rear of engine compartment near brake booster. [right hand drive, may be on opposite side in l/hand drive vehicle.

1996 audi a4
I think you should try this website link that I have attached. It helps you repair your vehicle easily without more help. Ask the girl in chat at the bottom of the page

No. I would go with the cheaper set.

there prob about 30.00 each
plus you need too replace the brake pads about 18.00 a set
probly find some one too install it all for 50.00
ask at auto zone

Try replacing the engine temp sensor. Temp sensor is telling ECU the engine is hot when its is actually cold. After the 6th attempt there is enough fuel in the cylinders to create a ritch mixture, then it goes.

TL