A couple of times over the past few weeks I've lost power whilst revving up in 1st or 2nd gear, only resolved by shifting down or laying off the accelerator until it hits idle. I presumed it was a misfire and plugged in the handheld vagcom, but no coils reported as misfiring. Engine warning light came on once in that period that was the lambda sensor again (same issue I haven't got round to sorting out).

Will a faulty coil always register...if so shall I change the coilpack? I put FR78s in about 5000 miles ago.

On the other hand, it's due an oil change in 1000 miles....could the loss in power be because of that? Anything else I'm missing?

On another note...I thought getting an oil change was quite expensive. The first one I did at an independent garage cost about £100 as part of the 60k service. Just realised booking online at national tyres will do it for £32. Is there a catch? Any benefit in doing it myself? (apart from being able to do the engine flush too)

Make 100% sure they use the right oil, not just any old cheap crap. VERY important on PD TDI engines, not so sure how fussy your 1.4 is but I think £32 would only just cover 5 litres of oil from a dealer, let alone bits like the oil filter, sump plug (if necessary), and labour. Obviously they're making some savings due to buying large quantities of oils and filters but even so, given that they'd probably charge £50/hour for labour normally, that doesn't leave much gap to turn a profit unless you're using the most basic of everyting.

yes a coil fault will register in engine ecu, however if it came up with a fault for lambda probe, it could mean the probe being fault is giving the ecu an incorrect signal from time to time and in turn the ecu will either to much or too little air or fuel in which would cause a loss of power .

Thank you very much for your thoughts. The kwikfit offer sounds too good to be true. I think I'll just source the bits from Partco and DIY it.

Presumably it needs RossTech to work out which lambda is faulty instead of wasting money on changing both of them, right?