Hi, hoping someone may have some ideas on the problem I have with my TDV8 as it's only doing 16mpg & doesn't pick up like it should... Occasionally it will go into restricted performance mode & I have to stop & start engine again to be able to continue & after this happens I get the fault code P023D manifold absolute pressure correlation bank A... Doesn't really smoke maybe a slight bit on hard acceleration from the R/H exhaust...

I have changed the Map sensors, swapped the air flow meters from another one, checked the turbo actuator rods & they move with ease & have inspected all the intake hoses...

It's a 2010 model & only done 50k so shouldn't be the turbo's I hope!


Any ideas would be much appreciated...

Maybe stating the obvious, but have you removed the top turbo hoses, and checked them for splits?

Yes checked all the induction pipes & also ran the engine with the top hoses off & they were blowing at a reasonable force even when putting my hand over each... I have compared it with another TDV8 & it's not running as smooth on idle & the pickup when you rev isn't as sharp... Thought maybe EGR related though would the computer not come up with a fault on that if it were to do with that?

Is there problem with one of the cats ?? 2008 G4 RRSport TDV8 current
2009 TDCi 90 current
2018 Discovery 5 HSE lux current
1994 Dakar current

Yes I was thinking of dropping the downpipes & taking it for a spin see if it made any difference... Quite low milage for that to be a problem I would have thought but maybe it spent it's life doing short trips & never getting blasted out.. Will give it a go though thanks...

rangieroveres wrote:

Yes checked all the induction pipes & also ran the engine with the top hoses off & they were blowing at a reasonable force even when putting my hand over each... I have compared it with another TDV8 & it's not running as smooth on idle & the pickup when you rev isn't as sharp... Thought maybe EGR related though would the computer not come up with a fault on that if it were to do with that?

Had the car go into limeted performance twice yesterday on my way home so plugged it in to laptop as I have the same setup as Land Rover with Torpix & got the same fault P023D-22 but it gave me the option of doing a Manifold absolute pressure MAP sensor test that I did... It came back with the sensor bank 1 falioure or wiring harness fault or the engine ecu is faulty & as I have changed the sensor & checked the wiring back to the ecu I'm wondering if it could be the ecu... I downloaded the latest software onto the engine ecu though that hasn't made any difference... The ecu is over a grand though so not something I want to change unless certain! I do have another TDV8 so could maybe swap the ecu though not sure that will work as it has to be programmed with vin num etc!?

Highly unlikely to be an ECU. I would double check all of the turbo hoses, intercooler for leaks, and the actuators for free movement

Otherwise, replacing parts with guesswork will end up getting expensive.

At this point, I would have to advise taking the car to an indy or a dealer. Much cheaper in the long run to spend a little on diagnostics than throwing parts at the car