So I'm looking into buying a 2004 A6 Quattro the check engine light is on for Mass airflow sensor and a gasket leak the guy is replacing and fixing all of the parts in a couple of days now with these parts being fixed is it a good idea to buy it from him or to hold off

 

Wow, that is an incredibly vague question. We know nothing about the car, seller relationship, costs, miles, engine, tires, brakes, service history etc. There is a million things to check before someone could give you actual advice if it is a good idea to get that car or not.

If you are worried, have the car inspected by a reputable shop (somewhere around 100 bucks should cover it) - this will give you at least a piece of mind.
Otherwise make sure you drive it at least 60 miles to give the engine enough time to throw any codes the seller might have cleared.

 

He is asking 4200 for it it is the 2.7 turbo motor with 167,000 miles on it the gasket that is leaking is leaking oil but is being replaced haven't gotten a service record yet I the process of that the brakes were replaced about 1,000 miles ago it was given aftermarket diverters by the previous owner I hope this helps out some for a response

 

there are several members that had good experience with the 2.7t engine so if treated well it can still be a fun car with 167k miles. I would definitely take it for a spin and make sure it drives good and the turbo sounds/feels good. Also make sure the timing belt was replaced (every 80k is recommended).
The one thing you will most likely encounter are electrical "gremlins", at least on my c5 I had one thing after another (dome lights, head light switch, etc) but the car itself always ran great.

 

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