How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask UK Tech. Your Own Question

UK Tech.
UK Tech., UK Car Mechanic
Category: UK Car
Satisfied Customers: 779
Experience:  BMW Technician.
9824428
Type Your UK Car Question Here...
UK Tech. is online now
A new question is answered every 9 seconds

I have an E60 525d SE, 48,000 miles. Symptom loss of power

Resolved Question:

I have an E60 525d SE, 48,000 miles. Symptom = loss of power under load. Initial diagnosis by BMW Dealer = regenerate Particle Filter (£300). No effect. Second diagnosis = replace Particle filter (£1,500). No effect, because third diagnosis = the CAT has gone as well, needs replacing (£900)........ In your experience how likely is it that the DPF and the CAT would both fail at the same time ???
Submitted: 4 years ago.
Category: UK Car
Expert:  UK Tech. replied 4 years ago.

Hi,

 

do you have any information on which fault codes where stored in the memory or if any warning messages were displayed in the instrument cluster?

 

 

Rich.

Customer: replied 4 years ago.
Rich
day before problem started a yellow warning light came on briefly (looked like upside down yellow light bulb with an exclamation mark in it - can't find that in the owners manual so don't know what it meant). Couldn't find any messages when I pressed "check". The lack of power problem started next day - but no warning messages. When the car had been to the BMW dealer and they had tried to regenerate the DPF - then got a warning light - looks like a yellow helicopter - to do with emissions ??
Customer: replied 4 years ago.
is(NNN) NNN-NNNNa fault code
or
B132_D5CSF ??

I am also uneasy about the fact that when I asked for the old Particle Filter that had been replaced, I was told that I'd have to pay more than £200 surcharge to keep the old, "broken" one - because the Dealer had to return it to BMW. Does that sound right ?
Expert:  UK Tech. replied 4 years ago.

It's going to be tricky to analyse their diagnosis without information on the fault codes or details on why the technician came to these conclusions.

 

The first diagnosis is perfectly viable. A clogged DPF can lead to a lack of power. But a clogged DPF can also be identified by monitoring the readings obtained from the engine's exhaust back pressure sensor. The technician should have taken note of these readings prior to the regeneration and then compared them to the readings obtained post regeneration. Only when comparing these can the DPF be replaced. It may even be necessary to attempt to regenerate the DPF more than once.

 

If it is then deemed necessary to replace the DPF (which isn't as common as most people might think) another back pressure sensor test should then be carried out to confirm that this was infact the original problem.

 

To then go on and say that the catalytic converter is the actual problem or part of the problem sounds a little like clutching at straws to me. A failing or blocked cat can be identified by monitoring the status requests of the various engine sensors via the testing equipment. Overall, i find it unlikely that both components have failed at the same time, unless the vehicle is very mileage.

 

What are the exact symptoms of the power loss please? When accelerating from standstill, under kickdown, when slowing and then accelerating away quickly etc?

 

 

Rich.

UK Tech., UK Car Mechanic
Category: UK Car
Satisfied Customers: 779
Experience: BMW Technician.
UK Tech. and 4 other UK Car Specialists are ready to help you
Expert:  UK Tech. replied 4 years ago.

Apologises, i've just noticed the mileage which is quite average so makes it even more unlikely. I hope that they are submitting a goodwill claim to BMW on your behalf dude to this and the age of the vehicle.

 

There will be a surcharge on the old DPF but even if you were to examine it there wouldn't be alot to see, but a comparison between the weight of the old one and the new one can give an idea of the amount of soot trapped inside.

 

 

Rich.

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
< Last | Next >
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
  • He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here. Diane Dallas, TX
 
 
 

Meet The Experts:

 
 
 
  • Marty

    European Car Expert

    Satisfied Customers:

    349
    ASE & Bosch Certified Master Tech. Over 30 years experience.
< Last | Next >
  • http://ww2.justanswer.com/uploads/EU/eurotec/2012-6-11_13153_mpjaphoto.64x64.JPG Marty's Avatar

    Marty

    European Car Expert

    Satisfied Customers:

    349
    ASE & Bosch Certified Master Tech. Over 30 years experience.
  • http://ww2.justanswer.com/uploads/IN/indytech/2013-8-8_102717_SantoDomingo146598x6402.64x64.jpg Greg's Avatar

    Greg

    Shop Owner

    Satisfied Customers:

    1040
    17 years Shop Owner /Technician. 27 years experience,
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    UK Car Mechanic

    Satisfied Customers:

    472
    12 years as a technician at a Ford and Jaguar dealer Ford and Jaguar factory certified
  • http://ww2.justanswer.com/uploads/35/350matt/2012-6-7_182356_matsavatr.64x64.jpg Matt's Avatar

    Matt

    Mechanical Engineer

    Satisfied Customers:

    4034
    BEng hons Mech engineering, in auto industry 22 years
  • http://ww2.justanswer.com/uploads/NA/nabilc/2011-1-24_205715_jap500.64x64.jpg Billy's Avatar

    Billy

    Trainer/Master tech.

    Satisfied Customers:

    1276
    Trainer - master tech., SAE member
  • http://ww2.justanswer.com/uploads/witt0018/2009-02-09_180738_trev2.jpg Trevor Witting's Avatar

    Trevor Witting

    UK Car Mechanic

    Satisfied Customers:

    815
    NVQ 3, Modern Apprenticeship, MOT Tester, 15+ years experience diagnostic technician
  • http://ww2.justanswer.com/uploads/RO/RobMechanic/068.64x64.JPG Rob's Avatar

    Rob

    UK Car Mechanic

    Satisfied Customers:

    811
    city and guilds level 1 2and 3. mot tester , 28 years experience set up training college in afghanistan