Is This Going To £Hurt£?

[wymberley]

Motorway run yesterday for the periodic DPF clean and a short local run later, no problem. Start up this morning, engine smooth but amber engine management light on and no real acceleration. Garage no can do until tomorrow. 57 plate 2l DCI X Trail. What else apart from the turbo, if anything? My problem is I'm quite deaf so can't hear if something isn't right. c79,000.

Edited January 30, 2017 by wymberley

[fruity]

May not be the turbo.

Could still be the dpf if it's saturated and the regeneration hasn't sorted it , could also be a sticking egr valve

[fortune]

With the price of everything getting cheaper it might be worthwhile looking at buying a diagnosis analyser. Quite often there may not be a real problem but just a fault code warning that needs to be cancelled. A garage will probably charge you £75 just to hook it up and cancel the code. +The agro of taking it there and they will probably want you to leave it with them so that you don't see how little time that it takes to plug in and cancel any codes. When this is done it will be clearer if there is any real problem. Have a look on YouTube to see if codes can be cleared by pressing buttons ect on the dashboard in a mode sequence. I have been told that on some vehicles that the particulate filter can be turned around and used in reverse to clear it through.

PS. They are bound to say that you need a major service just to empty your pocket into theirs.

Edited January 30, 2017 by fortune

[ditchman]

Motorway run yesterday for the periodic DPF clean and a short local run later, no problem. Start up this morning, engine smooth but amber engine management light on and no real acceleration. Garage no can do until tomorrow. 57 plate 2l DCI X Trail. What else apart from the turbo, if anything? My problem is I'm quite deaf so can't hear if something isn't right. c79,000.

 

simple solution......get an old landrover............

[four-wheel-drive]

On my 2003 Nissan X-Trail 2.2 td I did not have the light come on but did quite often have little in the way of acceleration in the end it turned out to be down to the suction valves on the engine fuel pump quite hard to get at but a simple job to do of course just my luck my pump had two valves instead of one so instead of it costing me £60 it cost me £140 for parts plus £60 to have them fitted but did it make a difference it was like driving a new car so all may not be lost

[four-wheel-drive]

Motorway run yesterday for the periodic DPF clean and a short local run later, no problem. Start up this morning, engine smooth but amber engine management light on and no real acceleration. Garage no can do until tomorrow. 57 plate 2l DCI X Trail. What else apart from the turbo, if anything? My problem is I'm quite deaf so can't hear if something isn't right. c79,000.

An old chap that I now has that problem I was in the garage the other day both of us getting fuel and when he pulled away I thought that he was going to burn out the clutch he was revving so much he really should get an automatic but he cannot afford to change his car now at 80 years old.

[wymberley]

An old chap that I now has that problem I was in the garage the other day both of us getting fuel and when he pulled away I thought that he was going to burn out the clutch he was revving so much he really should get an automatic but he cannot afford to change his car now at 80 years old.

Know what you mean, but I'm not that bad, it's the rattles and squeaks that i can't hear. DPF has been behaving since i started the motorway trips on a routine basis. Hopefully, I'll find out what it is relatively painlessly tomorrow.

Cheers, All.

[Cannon]

You could buy a code reader, but would you know what to do with it? Unfortunately 99.9% of the time it isn't as simple as resetting the fault code, as someone alluded to above. A code reader doesn't tell you what the problem is. It simply gives you a clue as to what to look out for. Then you have to use your head and other test equipment to diagnose potential causes of the problem.

 

If it does turn out to be the DPF, don't take advantage of any garages offer to remove it. New laws coming into effect soon will mean your vehicle will fail its subsequent MOT. As for rotating the DPF, in certain circumstances it might be possible, but it would be highly inadvisable. The DPF is designed in such a way to compliment exhaust gas flow. If you rotate it, the engine would have to work harder to overcome the cause of the restricted flow. This could damage your engine, and will undoubtedly lead to illumination of your EML, and a very noticeable reduction in power.

 

Best bet is to let the garage work their magic, as we would all just be guessing the cause of the fault on here.

[wymberley]

You could buy a code reader, but would you know what to do with it? Unfortunately 99.9% of the time it isn't as simple as resetting the fault code, as someone alluded to above. A code reader doesn't tell you what the problem is. It simply gives you a clue as to what to look out for. Then you have to use your head and other test equipment to diagnose potential causes of the problem.

 

If it does turn out to be the DPF, don't take advantage of any garages offer to remove it. New laws coming into effect soon will mean your vehicle will fail its subsequent MOT. As for rotating the DPF, in certain circumstances it might be possible, but it would be highly inadvisable. The DPF is designed in such a way to compliment exhaust gas flow. If you rotate it, the engine would have to work harder to overcome the cause of the restricted flow. This could damage your engine, and will undoubtedly lead to illumination of your EML, and a very noticeable reduction in power.

 

Best bet is to let the garage work their magic, as we would all just be guessing the cause of the fault on here.

Many thanks.

I'm pretty sure that it's not the DPF - the light has not come on and hasn't done so for over a year since I took the advice and started to do the regular motorway runs. Should never have sold my petrol version as I know where I'm at with that. Where I'm at at the moment is with the EML 'on' and the associated lack of power.

 

And you're right, I wouldn't have a clue what to do with it. Furthermore, at my age I've absolutely no intention of finding out - it can remain a mystery - far easier with my garage which I trust to dip into the war pension if need be.

[Bobba]

Motorway run yesterday for the periodic DPF clean and a short local run later, no problem. Start up this morning, engine smooth but amber engine management light on and no real acceleration. Garage no can do until tomorrow. 57 plate 2l DCI X Trail. What else apart from the turbo, if anything? My problem is I'm quite deaf so can't hear if something isn't right. c79,000.

I used to do the motorway run until my local garage recommended "Forte DPF Cleaner and Regenerator". I get mine from Amazon.

A bottle about every 15 mths. Haven't looped M32 / M4 for years. Highly recommended.

[wymberley]

I used to do the motorway run until my local garage recommended "Forte DPF Cleaner and Regenerator". I get mine from Amazon.

A bottle about every 15 mths. Haven't looped M32 / M4 for years. Highly recommended.

No chance on its own - I've heard that the 2008 model is prone to it in particular - belt and braces here, a bottle of Wynns every 4th tankful. Even then, 3 times around a 10 acre field rabbit shooting the evening before i was due my regular trip was enough to put it on as I accelerated up the M5 slip.

[db135]

If it's the older shape x trail I've replaced a fuw suction control valves on the high pressure fuel pump common on them the valve regulates fuel pressure the code for the fault says it's fuel rail pressure fault I'd still replace the fuel filter as a starting point

[wymberley]

1 error present P0235 boost pressure sensor - signal improbable. Carry out boost pressure plausibility check. Fault identifed with boost pressure sensor. Replace sensor and carry out sensor adaption reset. Carry out test drive and check operation = OK.

 

Whatever that means! I just understand the bottom line - £246.

[Westward]

A code reader doesn't tell you what the problem is. It simply gives you a clue as to what to look out for.

I'm not sure I agree with that. My car had the engine management light come on. The boss at my local garage was away and his mechanic who usually does our servicing put the fancy pants diagnostic machine on for free. I was there the whole time and he showed me the code and the explanation in the manual which simply said the mass air flow sensor needed to be replaced. I went home, ordered a code scanner on the Bay for about 12 or £13. When it arrived I plugged it on, identified the error code (which was slightly different from the one the pro system showed), typed it into Google and bingo... There are in fact several codes related to the MAF sensor and the one I had meant the sensor wire needed to be cleaned which I very carefully did, reassembled the air intake, cleared the error with little box and off I went. That was 38,000 miles ago and it's never happened again.

 

A cheap scanner, a tin of carb cleaner, 5 minutes on the net and a couple of hours of my time saved me about £200.

[Cannon]

I'm not sure I agree with that. My car had the engine management light come on. The boss at my local garage was away and his mechanic who usually does our servicing put the fancy pants diagnostic machine on for free. I was there the whole time and he showed me the code and the explanation in the manual which simply said the mass air flow sensor needed to be replaced. I went home, ordered a code scanner on the Bay for about 12 or £13. When it arrived I plugged it on, identified the error code (which was slightly different from the one the pro system showed), typed it into Google and bingo... There are in fact several codes related to the MAF sensor and the one I had meant the sensor wire needed to be cleaned which I very carefully did, reassembled the air intake, cleared the error with little box and off I went. That was 38,000 miles ago and it's never happened again.

 

A cheap scanner, a tin of carb cleaner, 5 minutes on the net and a couple of hours of my time saved me about £200.

In fairness you can't disagree with what I have said. The code didn't tell you that the wire in the MAF needed cleaning, did it? If I were to cut the MAF signal cable where it enters the ECU, you would still get a load of fault codes relating to the MAF. No amount of carb cleaner is going to fix that problem.

 

What you have done is guessed the fault, and been lucky that the solution was the one that you first opted for. I diagnose faults with cars on almost a daily basis, so I know that code readers can give you a bum steer. Take crankshaft and camshaft sensors for instance. You could get a fault code relating to a crankshaft sensor, but the fault could actually be the camshaft sensor. The ECU expects signals from both when the engine is running, but either could manage to send signals with the engine off if they were faulty. The ECU then throws a fault code for the sensor that isn't sending a signal, because it expects a signal from both sensor, even though the working sensor isn't supposed to be sending a signal with the vehicle off.

 

That is just one example of how a code reader could cost you a fortune in parts, by leading you to replace sensors that aren't actually faulty. You really need to go to oscilloscope level to do any in depth diagnosis, whereyou are able to physically see the signals.

 

As for the OP, it is unusual that your boost pressure (or MAP) sensor should fail. The MAP sensor communicates the boost pressure to the ECU, where it is interpreted and compared to upper and lower limits. If the boost deviates beyond either of these limits, the vehicle will go into limp mode. What your garage would have had to do I establish exactly why the MAP sensor was sending a faulty signal. Most times it's because of an air leak, vacuum leak, sticking variable geometry turbo vanes/actuator or a faulty boost control solenoid. I am presuming of course that the garage has done the proper investigation into the route cause.

[db135]

I had a 1.2 vw polo last week it was saying map sensor reading implausible the sensor was doing its job the problem was the timing chain was that worn it had the valve timing out that it was pressurising the inlet manifold on engine overrun with the throttle closed should always be a vacuum on overrun with closed throttle but not in this case a new timing chain kit fixed it is always like to look at live data from each sensor see what the engine ecu can see

[sportsbob]

1 error present P0235 boost pressure sensor - signal improbable. Carry out boost pressure plausibility check. Fault identifed with boost pressure sensor. Replace sensor and carry out sensor adaption reset. Carry out test drive and check operation = OK.

 

Whatever that means! I just understand the bottom line - £246.

A quick google suggests you have been charged three times what the job is worth , the sensor is £30 -£40 and it takes no time to change. As said by others invest in a code reader at the very least

[Westward]

The code didn't tell you that the wire in the MAF needed cleaning, did it? If I were to cut the MAF signal cable where it enters the ECU, you would still get a load of fault codes relating to the MAF. No amount of carb cleaner is going to fix that problem.

There are 5 separate codes relating to the MAF. The scanner presented 1 of the 4 specific codes whereas the pro system simply presented the general code for a faulty MAF. The OBD site offered several possible causes, the first of which was dirt or contamination. There is also a specific code for circuit malfunction in the event someone cuts the cable.

[wymberley]

A quick google suggests you have been charged three times what the job is worth , the sensor is £30 -£40 and it takes no time to change. As said by others invest in a code reader at the very least

You may well be right. 40 years ago I'd have been all over it like a rash. Now, being well passed my sell buy date I have to rely on the honesty or otherwise of the professionals and dip into a pension which is provided for the things I'm no longer able to do for myself. I would just say that I'd be very surprised if I was ripped off in this instance although I was charged some £50 for the sensor. The garage proprietor - a small family affair - is a fellow ex Brat and that wouldn't go down too well at all.