Is your car your pride and joy, or are you ready for a change? Let us know and you could win a £300 John Lewis voucher | No thanks
Ask a Question

Is there a defeat device in my Porsche Macan as with the Volkswagen EA189 engine?

I have a 2014 Porsche Macan 3.0-litre diesel, bought new. It recorded 42mpg or better on a long run and 39mpg average on short urban runs. Porsche wrote asking for the car to have a software update for emissions. I was very suspicious about this and received written assurances from Porsche UK that the fuel consumption would not be affected. But the mpg has fallen dramatically on short runs to 33mpg and on the long runs to 37mpg. I feel duped by such a prestigious company. Is there evidence that a defeat device exists in this particular device as per the Volkswagen situation?

Asked on 17 May 2017 by Peter Jones

Answered by Honest John
Less widely publicised than the 4-cylinder EA189, but yes. It's basically an Audi engine, subject to the NOx emissions fix. Reducing NOx creates more soot and active regeneration of the DPF requires more fuel, but readers have found that the system works a lot better on Superfuels such as Shell V-Power Nitro Plus or BP Ultimate, which you should be using anyway.
Similar questions
Has anybody else had a reduction in their fuel economy following the recent emissions upgrade? The range on my Audi A4 has gone from 620 to 570 miles per tank. Audi say it's nothing to do with the upgrade,...
I bought a brand new diesel Volkswagen Golf in January. There was a series of minor problems at first; tyres at the wrong pressure, pulling left, a burning smell next to the front passenger wheel arch,...
Since taking my 2011 Volkswagen Caddy Maxi 1.6 in for the emissions update I've noticed a marked increase in fuel consumption (down from 48-50+ to 36-38) and poor performance below 2000rpm in third, fourth...
Related models
Sublime handling even on rough British roads. Impressive performance from all engines. Excellent build quality. Practical family car.

Ask Honest John

Value my car

Amount to borrow
Sorry. The minimum loan amount is £1000
To pay back over

My credit score

Best available rate 9.20%

Total repayment £9,304.93

Total cost of credit £1,804.93


60 monthly payments

Apply now

Representative example

The Representative APR is 13.2% (fixed) so if you borrow £7,500 over 4 years at a rate of 13.2% p.a (fixed) you will repay £199.21 per month and repay £9562.20 in total.