Jim McA Posted May 15, 2020 Share Posted May 15, 2020 My 2016 Mondeo Titanium X 2.0TDCi 150BHP has a “Turbo Under Boost” problem. Under hard acceleration the power will drop significantly and it remains down in power until I turn it off and restart. Not an issue during gentle driving. The error code is P0299. No other fault code present. I checked all the hoses and intercooler for a leak but I couldn’t find any. I checked the turbo actuator and it holds the vacuum fine. The vanes are moving freely. I checked it in real time using Forscan and the wastegate needle is all over the place but the vane position is matching the acceleration There is a turbo control valve but I am not sure if this is the issue. Quote Link to comment Share on other sites More sharing options...
Jonro2009 Posted May 15, 2020 Share Posted May 15, 2020 I am admin of the most active UK Mk5 Facebook page. It's a great forum and extremely active, we have over 2000 members and our interaction record is huge. If you would like help with anything Mk5 related then please join us, I think there will be several people with the knowledge you need to try and diagnose your problem.https://www.facebook.com/groups/693277794183606/Sent from my SM-G965F using Tapatalk Quote Link to comment Share on other sites More sharing options...
Paul G. Posted March 1, 2021 Share Posted March 1, 2021 On 5/15/2020 at 10:47 PM, Jim McA said: My 2016 Mondeo Titanium X 2.0TDCi 150BHP has a “Turbo Under Boost” problem. Under hard acceleration the power will drop significantly and it remains down in power until I turn it off and restart. Not an issue during gentle driving. The error code is P0299. No other fault code present. I checked all the hoses and intercooler for a leak but I couldn’t find any. I checked the turbo actuator and it holds the vacuum fine. The vanes are moving freely. I checked it in real time using Forscan and the wastegate needle is all over the place but the vane position is matching the acceleration There is a turbo control valve but I am not sure if this is the issue. Hi Jim, I just bought a Mondeo Mk5 Estate 150 BHP TDCI and have the very same problem. Until I use the car in the city (Budapest Hungary) no matter how I drive it there is no problem. However, on the highway I get the wrench on the display and computer says "See manual". The motor control goes to service mode, no further acceleration just very slightly. Problem disappears when restart. Computer showed oil pressure problem that my serviceman thought it was an oil pressure sensor problem. Replaced the sensor but the problem remain. Did you manage to solve your problem? If so, I'd be glad to hear from you, it would be helpful for me. Preferably by email on ns.gabor@gmail.com. Thanks!!! Gabor P. Quote Link to comment Share on other sites More sharing options...
007 Mondeo Posted March 9, 2021 Share Posted March 9, 2021 Hello I had this problem on a 2L diesel, The garage fitted a snake pipe, which increased the intake pressure in line with a racing engine, I also had the louvers module changed which allowed high revving. Quote Link to comment Share on other sites More sharing options...
Mark M Posted March 11, 2021 Share Posted March 11, 2021 Out of interest, what's a snake pipe as I've never heard of that one, and how do the louvres effect your rev range? Wondered about retrofitting them and not heard about this. Quote Link to comment Share on other sites More sharing options...
tibbentiu Posted March 13, 2021 Share Posted March 13, 2021 I have the same problem man. My mechanic doesn’t know what the problem is and I can’t find it on the internet. However, when I changed the oil filter the problem disappeared, unfortunately not for too long because it came back.. I don’t know what to do, let me know if you found the problem please.. tiberiu.bojan@gmail.com Quote Link to comment Share on other sites More sharing options...
007 Mondeo Posted March 17, 2021 Share Posted March 17, 2021 On 3/11/2021 at 10:35 PM, Mark M said: Out of interest, what's a snake pipe as I've never heard of that one, and how do the louvres effect your rev range? Wondered about retrofitting them and not heard about this. Snake pipes are used in the racing side of Mondeo cars, they are a a silicon pipe with a steel outer spring which prevents movement and pipe expansion making sure you have more pressure at the turbo. If the louvers are not opening correctly on the turbo it can lead to your problem and the turbo blows eventually, rather than fit a new unit or turbo, individuals wire them shut which allows the car to run OK, but above 4000 rpm you hit trouble, A new turbo from Darlington costs about £125 on the return of your old one. Quote Link to comment Share on other sites More sharing options...
007 Mondeo Posted March 17, 2021 Share Posted March 17, 2021 On 3/11/2021 at 10:35 PM, Mark M said: Out of interest, what's a snake pipe as I've never heard of that one, and how do the louvres effect your rev range? Wondered about retrofitting them and not heard about this. For further information see Viper Performance pipes Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Ford UK Shop
Sponsored Ad
Name: eBay
Ford Model: FordUK Shop
Ford Year: 2024
Latest Deals
Ford UK Shop for genuine Ford parts & accessoriesDisclaimer: As the club is an eBay Partner, The club may be compensated if you make a purchase via the club
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.