Freelander 2 P007A Intermittent ‘DRIVING ME CRAZY’

[GarethFreelander]

So.... I’ve got a Freelander 2 Dynamic 63plate. 2.2 diesel 190bhp.

I’m having a intermittent problem which is driving me mad and is quite a big issue when towing. Reading code P007A on diagnostics, which I’m lead to believe is relating to the boost sensor on the inter cooler pipes.

Problem I’m having. Driving along fine...... get stuck it traffic (or through McDonald’s drive through) then the code above stikes and the car goes into some kind of limp mode but no lights on the dash. Revs very high but moves Very slowly, or a major delay when accelerating. Quite dangerous at times especially when pulling out of a junction or towing.

I’m also getting readings of -36 on ‘air intake temperature’. Here’s the kicker the IAT sensor which is meant to be located on the left side of the throttle body is non existent on my car. It’s blanked off (I’m assuming from factory) So the more I delve the boost sensor has only 2 wires plugged into it but a electrical socket for 4. Which I’m led to believe means this boost sensor is actually been used as an air intake temp sensor pre-intercooler. So again the code and the temp both point to this sensor. Further evidence points this direction as I can wipe the intermittent P007A code after it has occurred, if I unplug the boost sensor the P007A remains and won’t allow me to wipe it whilst unplugged. Again pinning the problem to the sensor.

What I’ve done so far......

Changed MAP sensor, MAP boost sensor, MAF sensor, Thermostat, Coolant sensor & Full Service.

I’ve scrooled the web and can’t find anyone anywhere with the same problem so I’d hugely appreciate anyone with great knowledge on this car and this engine that maybe able to shed light on the problem.

Regards

Gareth

Ps I can add pictures or anything required for anyone to help.

 

[GrumpyGel]

Sounds like the Freelander is just kicking into the acceleration mode of current Land rovers....

https://www.landyzone.co.uk/land-rover/freelander-2-acceleration-issue.333028/

 

[GarethFreelander]

Hi GrumpyGel,

With all due respect I’m not talking a little lag or slight delay. I’m taking when code hits the car can rev upto 4000 yet only be doing 10-20mph yet when working fine car would be flying 40+. It’s defiantly a fault somewhere.

Regards

Gareth

 

[GrumpyGel]

If the engine's revving and it ain't moving, wouldn't that suggest a transmission issue?

 

[GarethFreelander]

Yes It would to me..... I rang a Land Rover transmission expert who claimed he has never heard of anything like it. But.... it isn’t fetching up any transmission faults at all. And sometimes it’s not the high revs low speed it’s the lag in acceleration but not just a second or 2 a long delay then as if the penny drops it goes like a rocket. I’m still steering towards an electrical fault or something to do with this MAP boost sensor. As I can directly link the fault code with when the problem occurs.

 

[GarethFreelander]

Also the issue ONLY occurs after been stuck in traffic sat still for a couple of minutes. As of its temperature related cars not moving no air cooling engine therefore gets too warm causes problem. Although I’m not ruling a transmission issue out but all seems bit hit and miss.

 

[GarethFreelander]

PS I’m not a mechanic but I like to do work on my cars myself usually using the internet as a guide & my ex AA father in law as a guide. I know my way around a car but this seems bit beyond me yet I don’t want to spend £££ on someone else trialing & error like me.

 

[td4van]

There should be an air temp sensor on the throttle housing - can you get photos of the throttle housing and the electrical connections to it?

 

[GarethFreelander]

Hi td4van,

Yes I can send you a photo of where the air temp has been blanked. I didn’t about a week trying to find the sensor after buying the website yet failing to locate it. There is no wiring where the IAT is meant to be located either with further points to the MAP Boost sensor been used as an IAT. Give me 5 mins I’ll go take a picture.

 

[GarethFreelander]

So according to this imagine and what your saying the IAT should be here as per image

 

[GarethFreelander]

Here is a photo of mine where it is blanked. Very hard to photograph with its location but I’ve circled the torx screw which would fix the sensor as per diagram.

 

[GarethFreelander]

Here is a photo of the only in-connected connector anywhere near. Which is located just under the fuel filter.

 

[GarethFreelander]

This is the sensor on the intercooler pipe I suspect is been used as an IAT

 

[GarethFreelander]

This is the IAT sensor that should be on the throttle body that I can’t find and am assuming has been blanked and replaced by the Boost sensor doing a IAT sensor job.

 

[Nodge68]

Is it an auto or manual transmission?

Revving up without the vehicle moving suggest a transmission fault.

 

[GarethFreelander]

Auto

 

[GarethFreelander]

Can the gear boxes have intermittent problems or would it not just be constant? Surely it would through up a gear box error code if it was problematic.

 

[Nodge68]

Can the gear boxes have intermittent problems

Yes.

Surely it would through up a gear box error code if it was problematic.

If it's got a mechanical fault like a sticking solenoid valve, then it probably wouldn't give a code. But it also depends on what code reader you are using. A simple OBD2 code reader won't show gearbox codes.

 

[GarethFreelander]

I’m using Delphi diagnostics. Which does allow me into the gear box electrics?

Would low or perished gear box fluid cause the problem? I know these gear boxes are meant to be sealed for life according to Land Rover yet manfactorers recommend oil changes.

Also could a gear box fault be suspect for long lag on acceraleration?

 

[Nodge68]

Would low or perished gear box fluid cause the problem?

Bad or old fluid can cause all sorts of strange with an auto.

I know these gear boxes are meant to be sealed for life according to Land Rover yet manfactorers recommend oil changes.

No such thing as sealed for life.

Well if you don't change the fluid, the gearbox has a very limited life.

ATF is dead by 60K miles, so keeping it in there longer than that will only be bad for the box.

If there's a drain plug, the fluid can be changed.

It might not fix this particular fault, but it will extend the life of the box.