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 HDGENE Your Own Question
HDGENE, ASE Certified Technician
Category: Mazda
Satisfied Customers: 4782
Experience:  Master Auto technican
Type Your Mazda Question Here...
HDGENE is online now
A new question is answered every 9 seconds

Our 2002 MPV van's engine light keeps coming on and our

Customer Question

Our 2002 MPV van's engine light keeps coming on and our mechanic cannot fix it. He just replaced an exhaust manifold that was cracked and a O2 sensor. The light came back on after about 30 miles.
Submitted: 4 months ago.
Category: Mazda
Expert:  Ron Z. replied 4 months ago.

Do you happen to have the current p-codes that are setting the light?

Expert:  HDGENE replied 4 months ago.

Hello, what codes were stored for the checking engine light? The vehicle runs ok?

Customer: replied 3 months ago.
The van runs good. The codes that came up are: PO420 and PO401.
Expert:  HDGENE replied 3 months ago.

Ok P0420 indicates an issue with the Bank 1 catalytic convertor not cleaning properly ( emissions) and P0401 indicates a fault with the egr valve operation which is usually an issue with the DPFE sensor which measures egr flow. The cat code will set if the upstream oxygen sensor and downstream after cat, cat monitor sensor have the same readings, meaning the cat isnt cleaning the exhaust gases. so the cat convertor would need replaced.

Expert:  HDGENE replied 3 months ago.

Hello, do you need more help with this concern?

Expert:  HDGENE replied 3 months ago.

Hello, the question remains open until it is rated, if you need more help let me know.

Related Mazda Questions