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 Mike Your Own Question

Mike, Technician
Category: Car
Satisfied Customers: 39198
Experience:  Tech Expert
Type Your Car Question Here...
Mike is online now

Hello - the MAP sensor on my Saab keeps blowing i.e. it seems

Resolved Question:

Hello - the MAP sensor on my Saab keeps blowing i.e. it seems that once I go over a certain no. of revs it "blows" so that I lose power and the engine management light goes on, though sometimes it's then fine, power back etc. I bought a couple of replacement sensors which last about 3 months then go again. Just bought another which lasted 2 hours so not sure what to do......? Any help appreciated, thankyou
Submitted: 2 years ago.
Category: Car
Expert:  Mike replied 2 years ago.
Mike :

Hello and Welcome -

Mike :

My name is ***** ***** Im happy to help / advise -

Mike :

The Map sensor is usually a very reliable item - but can be ruined by ingress of fuel or carbon - which will finish them prematurely -that is your most likely fault.... It could be and over voltage fault - though I doubt it - but you could check the wiring... It should have a feed of either 5v or 12v... Im not 100% sure but if you see a reading close to each of those respectively, thats right --- If its well over 12 ..or say 9 .. then you have an electrical fault - that needs to be traced down.

Mike :

If the electrics are ok - then start by checking for fuel in the pipe that feeds the Map sensor ... If thats the issue - clean the pipe out and re route it so that it goes up and over to the map sensor - this stops that happening - unless its really bad in which case you would have to trace why...

Mike :

If its not that - then its usually carbon - the stage then is to remove the Egr valve and check / clean that inc the inlet manifold - what happens is flakes go up the pipe and ruin the sensor - One or the other as above will be your you will find it working through as above.

Mike :

Just one point - I assume you are buying / fitting new -not second hand... and a quality product -not a cheap type.. Such ones do fail .. Its best to always go for OE with these sensors.. they are under a fair amount of working stress.

Mike :

Im very pleased to have helped you - Do let me know if you need anything more --

*** Meanwhile - - >>>> Please do click on the "OK/ Excellent ratings" for me - Thank you in advance for that...

You can and are most welcome to get back to me anytime you might need - clicking the OK ratings does not close you out at all..

Kind Rgds, MIKE.


Many thanks Mike - will relay all that to the guy who fixes my car when it goes in again in a few days time

Mike, Technician
Category: Car
Satisfied Customers: 39198
Experience: Tech Expert
Mike and other Car Specialists are ready to help you

What Customers are Saying:

  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
< Previous | Next >
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, do indeed know your stuff. Jim
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
  • 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

Meet The Experts:

  • Greg



    Satisfied Customers:

    Automotive diagnostic tech
< Last | Next >
  • Greg's Avatar



    Satisfied Customers:

    Automotive diagnostic tech
  • Matt's Avatar


    Mechanical Engineer

    Satisfied Customers:

    BEng hons Mech engineering, in auto industry 22 years
  • Ross's Avatar


    Diagnostic and repair technician

    Satisfied Customers:

    Licensed diagnostic and repair technician
  • Rob's Avatar


    ASE Certified Technician

    Satisfied Customers:

    30 years trade experience
  • uk_iaibal's Avatar


    UK Car Mechanic

    Satisfied Customers:

    Verified Car Mechanic.
  • Billy's Avatar


    Trainer/ Master Technician

    Satisfied Customers:

    Trainer 8+ years, master tech. 10+ years, SAE member
  • Mike Kelly's Avatar

    Mike Kelly

    Auto Service Technician

    Satisfied Customers:

    17 years experience as an auto mechanic, foreign and domestic. 5 years running my own repair business.