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 indy-tech Your Own Question
indy-tech, Australia Car Mechanic
Category: Australia Car
Satisfied Customers: 7086
Experience:  All import and domestic car repairs and diagnostics
Type Your Australia Car Question Here...
indy-tech is online now
A new question is answered every 9 seconds

Mazda 3 I: Po oxygen sensor replaced and eml still came on....have

Customer Question

Po oxygen sensor replaced and eml still came on....have now replaced catalytic converter at great expense and eml still comes on, then had fuel injectors cleaned, and code cleared by scan, and eml still comes on... although it refers to it as being in history - am getting really cheesed off car was bought as demo model January 2011, it is a 2010 mazda neo hatch 2 litre, and has been serviced every six months
Submitted: 2 years ago.
Category: Australia Car
Expert:  indy-tech replied 2 years ago.
Hi .
Can you give me the code please .
Customer: replied 2 years ago.
Customer: replied 2 years ago.
Expert:  indy-tech replied 2 years ago.
Hi .
Sorry was working with another customer now working with you .
Expert:  indy-tech replied 2 years ago.
Hi .
This code is letting you know that you are running lean when this happens it will enrich the fuel supple.
Most when this happens is when you have a vacuum leak at the intake manifold .
First check for vacuum leaks
Best way to check for vacuum leaks if you see nothing wrong..
A simple squirt bottle filled with water and set to 'stream'
(not spray).
Then with the engine running you simply squirt water along the seam between the head and intake manifold and listen for any change in the engine's behavior.
Leaking exhaust pipe
Make sure the exhaust is sealed.
MAF sensor
Fuel pressure
Check fuel pressure if low replace the fuel pump .
Fuel injectors
Make sure they are working correctly you should remove and check the injector spray pattern
Was probably no need to replace the cat ????
Check the items above then get back to me with the reply button and not the poor or bad service rating , so i can get back to you with further assistance with this issue or offer assistance with another expert .
Rgds Greg
Low engine compression
Customer: replied 2 years ago.
According to the guy that replaced the cat, the engine was missing when starting from cold and he cleaned the injectors, the cat cost $1200 to replace, really not happy about that as I thought it had been a misdiagnosis
Expert:  indy-tech replied 2 years ago.
Hi ..
Did you drive the car a lot when the engine was misfiring ?
If you did drive for a long time with the engine misfiring then it possible the unburnt fuel that reached the cat and damaged it ,
Rgds Greg