Restricted Performance - 2010 3.0 Diesel - MAF Maybe!!! HELP

[Damo4runner]

So first major problem on the Discovery. I'll give you some quick background, self serviced since I have owned it about 2 years now. No issues except for tire wear, a little on that later on.

I have a 2010 3.0 Discovery 4 (100,000) on the clock, I have often heard a ticking noise from the front just after start up but never worked out what it was. Now the issue for the post, Travelling on the freeway doing 90kph and accelerated towards 110kph, instant 'restricted performance?. Pulled over and plugged in the Nanocom to get told I have the following codes:

P006A ? Manifold absolute pressure ? mass or volume air flow correlation (PENDING)
P00BF ? Mass or volume air flow B circuit range/performance ? Air flow too high (PENDING)

So limped home clearing the codes as I drove without too much drama. Cleared codes again and switched the vehicle on again codes still showing. Left it for the day. The next morning I turned on the vehicle and the code was still there, after the vehicle had been running for about 5-10 minutes the vehicle started to stutter and nearly stall, almost like it was starving for fuel or air (really rough idle). I took the MAF sensors off and cleaned with MAF cleaner and replaced, removed the MAP sensor and cleaned and replaced. Vehicle was still running rough. Turned it off and left it for the day, the next morning I started the vehicle and idle was running normal, but codes are still there.

I then I decided to change over the MAF sensors , cleared the codes and started the vehicle whilst cold, NO Codes appeared at first, but I could now hear the ticking/pulsing coming from the what I believe to be called the ?Turbo Charger Bypass Valve? located at the lower section of the right hand side, it is ?L? shaped and has an orange hose connecting to the intercooler and possibly 2 hoses connecting to the top of it. Pulsing could be felt when I touched it. At idle no codes, which is different to what it has been. Sat in the vehicle and raised the revs to 2000rpm. Restricted performance appeared on the screen, only 1 code showing in relation to this now:

P00BD ? Mass or volume air flow A circuit range/performance ? Air flow too high (PENDING)

From this I can only assume that 1 of the MAF sensors is faulty since the code now shows (A circuit) and NOT (B circuit). So my question is which MAF is faulty and why does the Turbo Charger Bypass Valve pulse loud enough to hear it and feel it. Also will swapping the MAF out fix the restricted performance from showing, I'm not sure that it will since the swapping of the MAF sensors has still produced the fault code, although it is not displaying the P006A code.

I have live data from the Nanocom, at: off, idle (776rpm) and (1808rpm original MAF positions) and (1845rpm swapped MAF positions) if this would help. The real key figures I can see from the information is the following: Both at approximately 1800rpm

Mass Air Flow (g/s) = 168 with the original MAF position, 65 once changed.
Air Flow b1 (g/s) = 5.3 with original MAF position, 21.1 once changed.
Air Flow b2 (g/s) = 327.6 with original MAF position, 230.9 once changed.

Any help or suggestions would be greatly appreciated, really wanting to get the code cleared permanently.

Cheers

Damo

[Graeme]

The secondary turbo inlet isolation valve is operated by a vacuum chamber whose vacuum is controlled by a servo on top of the motor. Early versions of the valve could become sticky from dirt build-up between the external lever and the housing. The stickiness can trigger reduced performance but fault codes including manifold pressure and turbo operation are normally included so that's unlikely to be the cause of your engine's current faults. It seems to me that the secondary MAF is at fault. Clearing the fault code is secondary - fixing the fault is the real concern. IIRC the MAFS are not identical so cannot be swapped, as I considered doing this when mine's isolation valve became very sticky, which only needed a good external clean to fix anyway.

[Damo4runner]

I think the MAF sensors are the same, the MAF near the front has a 4 wire connection to it and the rear MAF sensor has 3 wires. The sensors themselves have 4 wire connections.

The numbers on the sensors are all the same except for one line (the last line):

5WK97011
Made in Germany

4R8Q-12B579-AC
PHF500090
004069505
0012974

The other has the same numbers except the last line being:

0012950

When I swapped them, the fault codes swapped from bank a to b so I am sure I need at least one new MAF sensor.

Need to know where to buy one aftermarket, or I may have to pay Land Rover whatever they want for one.

Thanks

Damo

[Graeme]

My 2012 version of the parts catalogue has them as the same part number (PHF500090) although that number may have been superseded.

The 4th wire on the front/primary MAF will most likely be for the ambient air temperature sensor.

Try a UK supplier although be wary of what freight that want to charge.

Edit: I just checked and found that my 4.4 with a primary and secondary turbo arrangement similar to the 3.0 also uses the same MAF sensors for both intakes, although not the same ones as the 3.0.

[Narangga]

Finally determined my MAF had died

http://www.aulro.com/afvb/l319-discovery-3-4/239367-fault-code-p0100.html

Didn't want to wait 4 weeks for LRA to get me one from the UK so I spent 2/5 the money and ordered one from here

https://www.lrdirect.com/PHF500101-Sensor-Assy/?keep_https=yes

Chose the middle option which was $202 including freight on a Sunday night and it was delivered on the Monday 8 days later.

However it came in a VDO box :mad:

Hence the choice is yours:

https://www.lrdirect.com/PHF500090-Sensor-Assy/?keep_https=yes

HTH

[LRDisco_Fever]

does sound like the sensors a playing up but i would get a smoke test done to make sure you don't have a crack in the inlet. pretty common in 2010.

[Damo4runner]

I did think about the inlet crack problem the TSB does relate to my VIN number. I will order a sensor and find somewhere to do a smoke test, not to many mechanics in my part of Australia.

[Narangga]

I did think about the inlet crack problem the TSB does relate to my VIN number. I will order a sensor and find somewhere to do a smoke test, not to many mechanics in my part of Australia.

Which part of Tasmania are you in?

Justinc is in Kingston if you are not too far away.

[Damo4runner]

Other end of the state unfortunately.

[Damo4runner]

Ok so I ordered two new MAF sensors from LRDirect and they arrived, ordered them Wednesday night they were on my door Monday morning, pretty good considering it came from the UK and I'm in Tasmania.

So I have fitted the sensors and have driven it for about 100-150klms and no more Restricted performance codes so it would seem that I am now trouble free. Time will tell but thanks for all the help.

Damo

[lanesun]

Ok so I ordered two new MAF sensors from LRDirect and they arrived, ordered them Wednesday night they were on my door Monday morning, pretty good considering it came from the UK and I'm in Tasmania.

So I have fitted the sensors and have driven it for about 100-150klms and no more Restricted performance codes so it would seem that I am now trouble free. Time will tell but thanks for all the help.

Damo

I got "Restricted Performance" + "Transmission Fault" error message recently. After diagnose by Land Rover dealer, they did a transmission module software update first, but it didn't fix the problem.


Then they said it is a fault related to fuel pressure system and fitted a new fuel filter. However after few weeks of driving the same error message come up again.


I am feeling desperate now, really hope this problem can be fixed or I will sell the car. I was just wondering after replaced two MAF sensors, did it fixed the problem permanently? and which brand of sensor did you purchased, VDO or Land Rover one?

Thanks

[BradC]

I am feeling desperate now, really hope this problem can be fixed or I will sell the car

Don't load the parts canon. Get the codes read. There are literally a plethora of things that can cause "restricted performance" events, and going out on a limb with nothing bur a cursory search is just going to cost you time and money.

Number 5 : Malfunction. Need input.

[scarry]

I got "Restricted Performance" + "Transmission Fault" error message recently. After diagnose by Land Rover dealer, they did a transmission module software update first, but it didn't fix the problem.


Then they said it is a fault related to fuel pressure system and fitted a new fuel filter. However after few weeks of driving the same error message come up again.


I am feeling desperate now, really hope this problem can be fixed or I will sell the car. I was just wondering after replaced two MAF sensors, did it fixed the problem permanently? and which brand of sensor did you purchased, VDO or Land Rover one?

Thanks

Forget the dealer,take the vehicle to a good LR Indie.

They will read the codes and know where the issue is.

There is no other way to sort it.

Guesswork doesn't get you far with these vehicles,apart from wasting time and $$.

[DazzaTD5]

As already mentioned the 2 MAF sensors are the same and interchangeable.
You generally wont need to get a smoke test done, a cracked inlet manifold is very obvious, there will be some to a lot of black goo starting to cover all the injectors.

[DazzaTD5]

The secondary turbo inlet isolation valve is operated by a vacuum chamber whose vacuum is controlled by a servo on top of the motor. Early versions of the valve could become sticky from dirt build-up between the external lever and the housing. The stickiness can trigger reduced performance but fault codes including manifold pressure and turbo operation are normally included so that's unlikely to be the cause of your engine's current faults.

As Graeme has mentioned above, another sign is the air filter will start to get oil contamination from the secondary turbo inlet.