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rpmdiag, Tech and Instructor
Category: Mazda
Satisfied Customers: 8141
Experience:  Since 1975
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I have a 2006 Mazda 3 throwing a p2274 cel code. Had it

Customer Question

I have a 2006 Mazda 3 throwing a p2274 cel code. Had it diagnosed by 2 mechanics who changed out the downstream o2. Light came back on, brought it to drake who said it was the upstream o2 and the purge valve. Changed both of those disconnected battery to reset light. Light came back on with same code. What else could it be?
Submitted: 9 months ago.
Category: Mazda
Expert:  rpmdiag replied 9 months ago.

Hi, I'm Ron and I will be helping you today.
Stand by for a moment while I prepare your answer.

Expert:  rpmdiag replied 9 months ago.

For starters, someone needs to actually diagnose this with a lab scope.

If these O2 sensors are really good, then they need to diagnose the heater circuit from the PCM. If the wiring is good, then the computer is bad.

Thanks, Ron

Customer: replied 9 months ago.
How can I check the heater circuit
Expert:  rpmdiag replied 9 months ago.

With a lab scope.

Thanks again and please remember to rate me 5 stars now and keep
this link in case you need me again later on.
I don’t get credit for assisting you until you rate me

Expert:  rpmdiag replied 9 months ago.

Our goal here is to assist you in the repair of your vehicle by
supplying you with well educated information. We may not always
have the exact fix you wanted to hear, but our job is to get you on
the right track, which we always do. We can’t hear, see, smell or
touch your vehicle from where we’re at, so your understanding of
that is greatly appreciated. There are no magical or miraculous
answers, but we do our best to guide you in the right direction.
Thanks, Ron

Expert:  rpmdiag replied 9 months ago.

If you are satisfied with my answer, I would greatly appreciate a 5
star rating now and I will still assist you after you have rated me
too if another question pops up. I don’t get credit for helping you
until you rate me.
Thanks again, Ron