EGR Cooler failure (again)

Engine, Exhaust, Drivetrain, ECU Faults and Fixes
Past master
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Re: EGR Cooler failure (again)

Post by Past master » Wed Oct 10, 2018 9:59 pm

Thanks. That's a very useful explanation. I'm not sure if that's the problem on mine as I don't have the fault code - all I have from LR Assist is "low flow through egr". If it's a filter blocking up I can't see why it would spontaneously clear itself after a couple of days.
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Re: EGR Cooler failure (again)

Post by Barnsh » Wed Oct 10, 2018 10:22 pm

I might be wrong but whilst your engine is cold the EGR valve remains closed, it only uses the exhaust gas when engine is warm. So when you start the car after it’s cooled it would remain closed thus the flow sensor is not in operation till the engine heats up .
The same valve closes during a regeneration, so if the valve isn’t closing properly that might explain the EGR becoming blocked , so it could be a n EGR valve issue.

Does it appear to come on when you accelerate hard or go uphill or is it just coming on when coasting / light engine load .

There was another post I read where the EGR was changed only for the same fault to come back as the underlying root cause had not been found .
It will be worth asking them if they only change the EGR , what caused the fault in the first place . There is also a train if thought that changing the EGR every 30k is good practice.

The reference to clean air being fed back is a bit of a misnomer as it’s gas that’s “cleaner” than that which entered the SCRF it’s certainly not clean as in breathable air. Pointing the finger st the SCRF does seem a logical step if it is not performing as it should as return air will be less clean and clog. The other thing that can cause low flow of course is an air leak in the system, that also would affect SCRF performance.

Anyway it will be interesting to see what they diagnose , let’s hope they diagnose and not just change bits without investigation.
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Re: EGR Cooler failure (again)

Post by S marty » Wed Oct 10, 2018 10:48 pm

scrf should clean it to eu6 levels of soot, obviously you dont want to be breathing that directly, but Im more comparing to the olden days of egr valves getting full doses of sooty exhaust fumes,
Rubbing your finger in the tail pipe of a eu6 shows very slight soot, try that on a eu4 or earlier. you can black your face and go on a commando raid

Q86ARR's blocked filter explanation makes a lot of sense.


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Re: EGR Cooler failure (again)

Post by Past master » Wed Oct 10, 2018 11:32 pm

I don't think the egr valve is failing to close - that would have a noticeable effect on engine running. The warning light comes on completely at random - once was after a hard kickdown on the motorway, but that was not the case the other three times. It goes out when the car is stopped - twice after car stationary for a couple of days, but the latest time I literally stopped for about a minute, and the light had gone when I restarted. I will get as much info as I can, assuming they can fix it, and report back.
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Re: EGR Cooler failure (again)

Post by Q86ARR » Wed Oct 10, 2018 11:33 pm

Past master wrote:
Wed Oct 10, 2018 9:59 pm
Thanks. That's a very useful explanation. I'm not sure if that's the problem on mine as I don't have the fault code - all I have from LR Assist is "low flow through egr". If it's a filter blocking up I can't see why it would spontaneously clear itself after a couple of days.
The description of DTC P049B-00 is “EGR ‘B’ Flow Insufficient Detected”

This generally leads to low pressure EGR cooler and SCRF/DPF replacement, after an intake leak system test has been carried out to ensure no leaks are present!


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Re: EGR Cooler failure (again)

Post by NoDiscoSport » Thu Oct 11, 2018 12:39 am

Q86ARR wrote:
Wed Oct 10, 2018 11:33 pm
Past master wrote:
Wed Oct 10, 2018 9:59 pm
Thanks. That's a very useful explanation. I'm not sure if that's the problem on mine as I don't have the fault code - all I have from LR Assist is "low flow through egr". If it's a filter blocking up I can't see why it would spontaneously clear itself after a couple of days.
The description of DTC P049B-00 is “EGR ‘B’ Flow Insufficient Detected”

This generally leads to low pressure EGR cooler and SCRF/DPF replacement, after an intake leak system test has been carried out to ensure no leaks are present!
Not forgetting of course the replacement of the low pressure EGR valve. JLR Letter dated 24th October 2017...

Capture.PNG

...leading to rejection for "not of satisfactory quality" and "not as described" under the CPA 2015.
17MY DS150PS 6 speed manual. Rejected as "not of satisfactory quality", "not as described", Consumer Rights Act 2015.


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Re: EGR Cooler failure (again)

Post by Past master » Mon Nov 12, 2018 6:51 pm

Well the dealer finally found time to look at my car, although not to fix it. They have ordered an egr cooler and a "dpf filter" (I think I know what that means). They aren't going to change the egr valve though. in the meantime they have at least cleared the codes, so I won't have the little light shining at me (I know it's not important, but it's a bit annoying when it's on). To be fair, the dealer this time round were on the ball and as far as I can tell have made the correct call. Delays are down to my wanting a courtesy car - I think they are scrimping a bit on these. Why can't they just hire in a few piddling little Citroëns like TVLR do? All I need is something to get me from A to B. The 68 reg DS they gave me today had a rougher sounding engine than mine and the Conti tyres were really noisy. Not convincing me to buy another one!
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Re: EGR Cooler failure (again)

Post by Barnsh » Mon Nov 12, 2018 7:25 pm

Past master wrote:
Mon Nov 12, 2018 6:51 pm
Well the dealer finally found time to look at my car, although not to fix it. They have ordered an egr cooler and a "dpf filter" (I think I know what that means). They aren't going to change the egr valve though. in the meantime they have at least cleared the codes, so I won't have the little light shining at me (I know it's not important, but it's a bit annoying when it's on). To be fair, the dealer this time round were on the ball and as far as I can tell have made the correct call. Delays are down to my wanting a courtesy car - I think they are scrimping a bit on these. Why can't they just hire in a few piddling little Citroëns like TVLR do? All I need is something to get me from A to B. The 68 reg DS they gave me today had a rougher sounding engine than mine and the Conti tyres were really noisy. Not convincing me to buy another one!
You do realise you could actualy reject it and at least have a larger deposit againscwhat ever you decide to get next be it landrover or not.
They’ve had more than enough chances to fix it in the eyes of the law.
Better than any trade in if you subtract 40p a mile driven.
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Re: EGR Cooler failure (again)

Post by Past master » Mon Nov 12, 2018 9:18 pm

Not in my case -
1) OK this is the second time it's been in, but it's an intermittent fault, fair's fair
2) The fix seems reasonable
3) Rejecting a 2½ year old 40,000 mile car seems a bit anti-social
4) This is only the second problem I've had with it - both emissions related
5) and anyway, I rather like the car, and the emissions stuff is less of a problem than with a new one (less Adblue, etc etc).
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Re: EGR Cooler failure (again)

Post by Barnsh » Mon Nov 12, 2018 10:54 pm

Ah , in that case it may be harder to do for little gain.
Hope they finally fix it for you.
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MY17 HSE 180 gone
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