Get the latest advice about your car

Get Started
Advice » Q&A » 1995 Volvo 850

Q&A

Ask Your Question

1995 Volvo 850

Question: Check engine light keeps coming on after repair

Question

roadmaster99, 2.4L 5 Cylinder, Baltimore, MD, June 15, 2010, 08:50
Profile_thumbnail
 Rookie

check engine light on indicated faulty 02 sensor. sensor was replaced but check engine light came on again this time indicating vacuum leak. vacuum leak repaired (replaced air intake hose) Check engine light is back on indicating 02 sensor again. Can a vacuum leaks foul out a brand new 02 sensor? what would be the next step? Should the vacuum leak been repaired first before 02 installation?

Roger Warren Baltimore MD roadmaster99@netzero.net

1 Answer
Answer It
Flag This

  • Answer #1

    Bret Bodas June 15, 2010, 08:57
    Profile_thumbnail
     Master

    Roger, what codes are you getting? Where did you get the O2 sensor that you installed? Are you sure all the vacuum leaks are fixed? Make sure the intake manifold gasket isn't leaking.
    These codes are tricky, an O2 sensor is monitoring the fuel mixture, so anything that changes the fuel mixture (vacuum leaks) will cause possible incorrect sensor readings.

    Reply
    Flag This
Answer Ranks

This week's top 10

1 globalhelper 6 carpetvan2
2 milesauto 7 obdcar
3 csubak30 8 2004toycam
4 jose8889 9 Transmission-Tech
5 Merrimack Auto 10 Camster