Jump to content


Photo

Management light problems


  • Please log in to reply
1 reply to this topic

#1 John nrac

John nrac

    Newbie

  • New Member
  • Pip
  • 2 posts
  • Ford Model: Mondeo
  • Location:

Posted 02 February 2010 - 09:45 AM

Hi, I'm having an ongoing problem with my 2002 2.0 Mondeo lx and it's frustrating me no end. Basically the engine management light came on a while ago so I plugged in OBD (on board diagnostic) machine and it showed up with the code P0420 which it says is a fault at the catalytic converter system/bank 1 and the effeciency is below the threshold. I have changed both the lambda sensors but the problem still exists and the same code comes up.

Could there be a problem in the wiring or somewhere in the system?

Please help! Many thanks in advance.

Have something to contribute?

Sign in or register to start a topic...



Sign up to FOC Premium Membership To Remove These Ads

#2 mintalkin

mintalkin

    Ford Enthusiast

  • True Ford Enthusiast
  • PipPipPipPipPip
  • 3,550 posts
  • Name: mintalkin
  • Ford Model: mondeo tdci 130
  • Year: 2006
  • Location: Staffordshire

Posted 02 February 2010 - 04:00 PM

if you can try testing the sensor for output by connecting to it a digital voltmeter, set to a 2v scale. Connect the +ve test lead to the sensor signal wire [See wire colours] and the -ve test lead to earth/battery -ve. The voltage produced should swing from app 0.6v to 1.0v and back around once per second. If the voltage is stuck high then the engine is probably running rich for some other reason. If stuck low then usually either a faulty Lambda Sensor,or an air leak.


Not what you're looking for?

Register now, we have a huge community of enthusiasts to answer any questions you might have



0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users