EGR Fault

[Leslie]

I had a quick google of the codes and 4590 seems the most likely one for not starting, the fact it started up soon after suggests the rail pressure wasn't high enough ,if it doesn't meet a certain pressure a start will not be allowed , a good cranking speed is important for this from a fully charged battery but injector leakage or a failing intank pump can be other causes. I suspect this is different from your original issue or maybe you have several intermittent faults .If the dpf has been gutted and mapped out it can't be an issue now . The next step would be to get someone to check the fuel pump pressure from the tank pump and injector leakoff with software and see if they are in spec.

Check the following possible fault causes:
- Pre-supply pressure too low (filter blocked, leakage on low pressure side).
- Incorrect value displayed by rail pressure sensor.
- Leakage in the high pressure area.
- Injector jammed open.
- Worn high pressure pump.
- Worn injector.
- Internal leakage in the common rail system.
- External leakage in the common rail system.
- Air in the common rail system.
Check possible fault causes, perform system test - rail pressure control

[Leslie]

How many miles has the car covered ?, there was only 1 high pressure pump failure on a 40d on here and that was about 200,000 miles

[X5Sport]

Remember that under the 2019 MOT rules any sign of soot on the exhaust on a car fitted new with a DPF is an automatic fail. Deleting a DPF these days is unwise as the MOT Centres are looking for it and will know your car should have one. With a missing DPF there will be soot. The smoke test will also reveal its absence as the reading will be too high. Coding it out won’t stop it being discovered.

[Eminem0473]

Hi thankyou for the replys.The car has covered 123000 miles. I only went for the egr and dpf delete because I couldn't get anywhere to sort the glow plug issues without removing the cylinder head. At the moment that is a cost I can afford. I have just spent approx £4500 on other repairs which included a turbos, new egr valve. Like I mentioned before I was still getting the same egr fault codes even after a new one was fitted. I was just wondering if the new issues could have been related in any way to my previous egr problem. Thanks

[Leslie]

Which turbo was replaced as one of the codes is still turbo related and why was turbo replaced to start of with ?

[Eminem0473]

Both turbos were replaced and all I was told was the turbos had failed. Thanks

[X5Sport]

Who’s doing the all this work for you?

[Eminem0473]

Hu thanks for your reply. One garage replaced turbos water pump and egr valve and also cleaned the dpf. Then a different garage physically removed the dpf. Then a mobile company deleted the egr and dpf from the ecu.

[Eminem0473]

Does anybody know how difficult it is to replace the o2 sensor and exhaust temp sensor? Thanks

[X5Sport]

There are two. One at the top of the Cat/DPF and one just behind it on the main exhaust outlet. Both appear to be a case of unscrewing and refitting. Item 1 in the top drawing and 2 in the lower.

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[Eminem0473]

Hi thanks for the information. If there is 2 o2 sensors do you know if the codes state which one is faulty. Thanks

[X5Sport]

The codes are supposed to say either ‘before’ or ‘after’ the catalyser (their term for the DPF/CAT), (2C2C (before) or 2C7F (after) might be the ones you are looking for). May need a non-generic code reader to pick that up though. I can’t find the actual codes for the E70 40d.

[Leslie]

If the dpf is gone and a bypass in it's place there won't be anywhere to fit the sensors or is the dpf back in but with the inside knocked out of it ? I know in America they seem to just get rid of all the emissions equipment at the first sign of trouble , I know here in Northern Ireland a car with an empty dpf case will still pass mot as they don't check Diesel emissions as the pollution would be considered excessive for the government workers as all our cars are tested at just a few centers so 100's of cars per day rather than an local garages on the mainland where you might only mot a few cars a week .

I don't know how likely both turbos failing is on a 40d as they are different to a 35d where they have a big and small one and as the small one does most work it tends to fail first and blow oil into the big one .

[X5Sport]

I don’t think I’ve ever seen a report of both turbos going on either a 35d or 40d, and it was rare even for the singleton on the E53 as well.

Code 49ef is a short to ground on an O2 sensor. Changing it requires coding action to reset the adaptions in the DDE memory.
Code 4986 is the exhaust gas temperature sensor before the DPF - the upper one is faulty, or the wiring to it is.
Code 4207 is an open circuit on the O2 heater line. Code 4206 also the same issue. Possible wiring issue.
Code 4258 is the DDE noting an issue on the O2 sensor diagnostics
Code 4590 - fuel rail pressure as above. Code 48F5 is the same.

Probably worth have a good look at the wiring to the O2 sensors themselves as there seems to be an electrical connection with all of these faults. The issue might be a damaged loom, dirty connectors etc.

[Eminem0473]

Don't suppose I will know if both turbos actually failed but what I do know is it cost me over £3000 and they told me they had changed both. The insides were removed from the dpf. It's just so frustrating that I have owned this car since September last year and probably haven't even covered 1000 mile yet because its never been right since the turbos failed.