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Hi the trade off was for the escalating emissions targets, the loose engines as termed were produced as a looser fitting piston does not create as much friction as the conventional tight bore, less friction creates less emissions as it reduces the heat inside the bores thus cutting back on C02, every engineering principle for engines is that they run better when very hot but this has the side effect of raising emissions, Ford almost got round it with the CVH lean burn engine this ran hot but because of the lesser fuel charge it produced less emissions but unfortunately the oil technology at the time let it down. All modern petrol engines burn a little oil its part of the price we pay for driving new off the forecourt and thrashing it a couple of days later which further down the food chain won't help the second hand buyer. Steve.

Hello, Basics first - I would advise getting the battery efficient checked. Kind regards, Gareth.

Hi, this is the overview of your code error. possible an air leak if the manifold has been removed or a leaking hose, i'd be checking all the hoses etc for tightness to start with then working from there for leaks . if all ok then go to next items. 16555/P0171/000369 - Fuel Trim; Bank 1: System Too Lean Possible Causes Mass Air Flow Sensor (G70) defective Intake System Leak(s) Possible Solutions Check Mass Air Flow Sensor (G70) Check Fuel Pressure Regulation Check Fuel Pump Check Injectors Check Intake System for Leaks Check Exhaust System for Leaks Check Secondary Air System for Leaks Check Vacuum Pipes for Leaks also this . P0171 Audi Description With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios. In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the Malfunction Indicator Light (MIL) (2 trip detection logic). IT may seem mad but has the MAF sensor plug been refitted properly, also worth a check just to eliminate connection issues.

It says a4 2001-2008 with Parking heater is compatible. Did a4s cone with a parking heater? I think you'd be ok. Alternatively you could always contact Audi directly.

I don't think TT engines were as susceptible to the major problem of dodgy piston seals. Have read here and maybe do some googling on the TT engine type http://casestudies.atlanticmotorcar.com/audi-engine-oil-consumption-correction/ Engine codes CAEB, CDNC and CNDC were tv he main offenders. But as mentioned by you and on other threads here - the petrol engines are *designed* to consume oil. I think it is a trade off for cost of build v tolerance in the moving parts.