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Discussion Starter #1
Hi
Im a new member and have owned my 2008 4007 gt for 1 year. Only issues have been suspension and easy to sort out. Unlike the bulbs in the headlights. However I regularly tow caravan 1240 kg and this week i've had the engine management or pollution symbol ( i'm not sure which is the best description) come on and send me into limp mode ( which isnt funny with a caravan) all i have to do is stop, hod up the traffic, and start again and revs returns and its ok. Eventually the light goes off. However its happened again today after about another 150 miles. Light is still on today. Ive read about the code reader but being a new member not sure what help i can solicit from you guys. By the sound of it the main dealer is the only other alternative. Im located in mid beds between hitchin and bedford.

For background info ( should it be relevant ) my ASC button triggers no lights on dash board or anything. its never worked since i bought car although i didnt even go near it for many months so if it did work i wasn't aware of it. Is this a tricky ( expensive) thing to solve?

All help gratefully received and any ways to tap into the diagonistic resources at this early stage in my posting career.
 

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Discussion Starter #3
Hi Gibbo

Thanks. I looked at this and found a member Savage but whether he sees it is debatable as the 4007 forum is a bit tumble weed. I cant pm him yet until i've hit 20 posts. which I hope to do soon and hopefully generate a bit more traffic on here.
 

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Discussion Starter #4
5 fault codes

Im not hanging about so I've got the diagnostic report from local garage:

P0238 Inlet Air sensor ( MAF most likely)
P0100 Flow meter signal ( MAF most likely)
P0606 Ecu ?
P1700 Ecu ?
P2408 additive system ( possible error on fuel cap sensor or wiring its thought)


Interested to know what the Ecu faults could be. However i think a new MAF is best course of action to take. Its seems its more likely its the fault which is creating limp mode.

hope so
 

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Discussion Starter #5
Thanking "Bettyswollocks" for this earlier post.....

"For those looking up the P0100 fault code


P0100 - Mass Air Flow Circuit Malfunction
The mass air flow or MAF sensor is placed in the intake air duct between the air filter and the engine intake manifold. The MAF sensor measures the amount of intake air flow. The MAF sensor converts the air flow measurement into a voltage or frequency signal, with the voltage or frequency changing proportionally to the amount of air flow. The air flow sensor signal is monitored by the engine computer (ECM). The engine computer (ECM) uses the mass air flow signal to know the engine load and to calculate the proper amount of fuel injected. If the signal from the mass air flow sensor is out of expected range, the ECM detects a fault and sets the code P0100. For example, the mass air flow sensor signal could be higher than expected when the engine is not running or lower than expected with the engine running. A car with the code P0100 may have some driveability issues, such as stalling, lack of power, surging, hesitation, etc. In some cars, the code P0100 can cause the fail-safe mode where the engine speed would be limited to 2,500 - 3,000 rpm.
If there are other trouble codes present, they might need to be looked at first. Checking the freeze frame may help, as it may contain some important information. The freeze frame is a snapshot of the engine parameters at the moment when the fault was detected. The freeze-frame may show whether the vehicle was running or stopped, whether the air–fuel ratio was lean or rich, was the engine was cold or warmed up at the time of the malfunction."
 

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Im not hanging about so I've got the diagnostic report from local garage:
You didn't need to "hang about" if you'd read the details in the links I posted:

I can't send PMs!

This is to prevent spammers harassing members. To get your PM privileges enabled you must have contributed 20 posts to the forum. If you don't want to needlessly comment on random posts, use the NEED 20 POSTS BEFORE PM thread.
Please also see FAQ item 8 about diagnostics. We're just trying to save you time and money by making sure you're not given incorrect information by generic scanners, especially if they can't tell you what P0606 means.
 

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Discussion Starter #7
Thank you for your help. I think the P1700 is the tricky code as a search has not thrown up any results as yet. Ill post for that one.
 

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Discussion Starter #9
Well its a manual and has never stuck in gear yet so perhaps thats another faulty sensor having a moment.

Im getting a second inspection tomorrow because in discussion with my local garage ( who didnt do the diag.) the P0238 code might suggest an overboost which in turn has triggered the P0100 air sensor. So maybe there is a split turbo hose somewhere and nothing wrong with my MAF. The P0606 is not so helpful as it suggests the ECU is faulty but no more than that.

I thought theses codes were meant to help mechanics but all they do is disagree.:nono:
 

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The codes are helpful if:

1) The mechanic knows how to interpret them.
2) The mechanic doesn't use generic scanners.
3) The diagnostic equipment reads live data.
4) The mechanic knows how parts work in-conjunction with another and can fault codes along the chain of components.

As my link in the FAQ states, too many "mechanics" just rely on the fault code and throw a part at the problem.
 

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Discussion Starter #11
Easy to say but the trade is not consistent.

Many threads testify that the main dealers are littered with ill informed mechanics who throw parts at the problem which is fine when you have warranty but shocking when you dont and have have to pay for errors. In my case I went to an expert garage with Lexia and Im not certain about diagnosis. Are they good mechanics ...I cant tell.

I've now got to go to another garage because the first wont touch warranty work. In my case Warranty Wise ( insert POV on Quentin) This is where its complicated because it may have been a fault that wasn't covered by my warranty however should it be the MAF and cap sensor eg i think i can claim it.

So today I go to a garage which will do warranty work. They looked at the data yesterday and almost instinctively say....thats not the MAF. ( are they good mechanics I dont know) So thats where I stand until it is inspected today. Ill let you know what they say later.

If i go to a main dealer and need warranty Quentin and his mates don't pay full fees as its maxed at £50 hour inc vat.

So fault codes are useful but only to those people that can drill down into the data and understand them. Do you know if there a certificate or acreditation or guaranteed level of expertise ensuring mechanics can achieve that? or is a local training issue according to car brands?
 

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Discussion Starter #12
MAF checked and no faults found all working inside parameters.
Turbo wastegate and boost all checked no problems.
All air hoses inspected no obvious leaks bar one jubillee clip changed on crankcase air hose but doubting that was the issue.
Codes cleared and car ran with no new codes.

watch this space
 

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As you have found reading fault codes is just 1 thing that helps in diagnosis it is NOT going to tell you whats wrong.

Sometimes common faults can be diagnosed with just seeing the usual list of codes coming up but with diesels especially you need to see live data readings and spend time with the car to get results.

From reading your first post it seems your car missbehaved when being worked so its probable that an overboost or underboost issue caused the actual limp mode there are various reasons for this vacuum loss being a very common one then EGR issues.

low or high boost will impact on airflow hence the airflow fault codes does not mean the flowmeter is faulty it simply means it seen something it did not expect and logged a fault.

Faults in EGR system will also affect airflow and can log an airflow fault again meter NOT the actual cause.

Garages need to understand what the computer is actually telling them sadly many do not and no there is no standard training regime at least not a compulsary one.
 

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Discussion Starter #14
I've just competed another 360 miles towing and had no reoccurrence of the fault. Which I'm glad about. I can well believe it might be the egr and whilst a clean is a very good idea i cant seem to find any how to pics related to this 2.2 hdi engine. Ill keep looking.
 

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Discussion Starter #15
2 months later and no reoccurrence of fault......... glad i didnt buy a new MAF
 
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