2.7 twin turbo - P0404 & lack of power

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Joined: Fri Jan 04, 2019 7:02 pm

2.7 twin turbo - P0404 & lack of power

Postby keithstype2.7 » Sat Jan 05, 2019 4:33 pm

Hi All,

I have owned my 2007 S Type 2.7 SE auto for over 9 years with mostly trouble free enjoyment. However recently it started showing the amber Restricted Performance light but when re-started the light went off. This happened more and more often until the car now has a lack of power (as if the turbos don't kick in) and on using an isoft i930 code reader, it is showing P0404 which refers to the EGR performance out of range. Going inside the i930, both EGR valves are showing 5% and from this I understand that they are ok. (Maybe I have misunderstood this??)

I can clear the code temporarily but as soon as the car gets a bit warm the light comes back on. The lack of power is always present.

I have tried EGR cleaner via the air intake and also am using Millers Diesel Oco Plus in the fuel and whilst the car generally runs more smoothly, the lack of power is still present as is the P0404 code.

Has anyone has similar problems and if so, how was it rectified please?

Posts: 226
Joined: Thu Oct 25, 2007 5:00 pm
Location: Stokenchurch

Re: 2.7 twin turbo - P0404 & lack of power

Postby rosemary » Thu Jan 10, 2019 8:57 pm

Hello Keith
I assume as your car is Post 2005, i.e. you quote 2007 and it has Catalytic converters and Diesel Particulate Filters, I assume as such. Do you do short journeys.
Mike Kennedy will confirm that short journeys are an anathema to Diesels and result in blocked filters and Restricted Performance indication coming up. Perhaps an Independent Jag Specialist can help, plus the use of propriety cleaners.I can't comment on the EGR valves mine were changed at 85k because the Jag Main Dealer really didn't have a clue what he was doing to cure a misfire, Meccano would have confused them anyway.
Dave Hart
2005:-S Type V 6, 2.7D
2009:-XF 3.0D V6 Premium Luxury

Posts: 522
Joined: Mon May 31, 2010 2:56 pm
Location: Stockport

Re: 2.7 twin turbo - P0404 & lack of power

Postby jeff1954 » Sun Jan 13, 2019 6:18 pm

Check the MAP (manifold absolute pressure ) sensor located in the top of the inlet manifold held in by a small torx screw. The top engine cover has to be removed to see it. It gets gunged up after time and can be cleaned or replaced, the latter is probably the best option. Mine caused the restricted performance light to come on and erratic gear changes. Buy a genuine Jaguar one they are the best.

S Type 2.7d SE Auto

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