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 Matt Your Own Question
Matt, Mechanical Engineer
Category: Volvo
Satisfied Customers: 23195
Experience:  BEng hons Mech engineering, in auto industry 22 years
Type Your Volvo Question Here...
Matt is online now

What is most common fault engine management fault code PO505

Customer Question

What is most common fault engine management fault code PO505 on 1999/2000 V70 2.5 classic estate?
Submitted: 1 year ago.
Category: Volvo
Expert:  Matt replied 1 year ago.


P505 = Idle air ontrol system

1st thing to check is that the throttle is opening and closing smoothly

if you rerove the air intake pipe so you can see the throttle butterfly and then with the ignition on but engine off have your assistant slowly push down on the accelerator and the throttle should open smoothly with no sudden movement

if this is ok then there's an electronic valve on the air intake pipe just before the throttle body. it's used to vent engine fumes back into the intake and can stick open

if you can blow through it with the ignition off then it will need replacing or try blasting some brake cleaner through it 1st to see if it frees off

Expert:  Matt replied 1 year ago.

do you still need help?
Bear in mind that the site takes a deposit from you at the beginning and this is held by the site until you rate my answer at which point the cash is split between the site and the expert. I am only paid for my work on this question if you rate my answer, using the star system at the top of the screen. Please do not forget! Thank you