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George H.
George H., ASE Certified Technician
Category: Mazda
Satisfied Customers: 18668
Experience:  15+Years
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I just paid my 20$ 91 mazda b2600i check engine light on

Customer Question

i just paid my 20$ 91 mazda b2600i check engine light on code 17 replaced o2 sensor swapped ecm with another then put old one back light is still on
Submitted: 1 year ago.
Category: Mazda
Expert:  George H. replied 1 year ago.

Hello I will help you with your question,

Do you still need help with this?

Do you have a voltmeter to check the sensor operation?

Expert:  George H. replied 1 year ago.

Please respond on this page.

You will need to verify that the sensor voltage to the computer does change after the engine is warmed up and run at 1500 rpm. If you can get a meter I can help you test this.

The other things that affect the setting of this code are intake or exhaust leaks, even a small one will flatline the sensor.

Let me know if you can get a voltmeter

Thank you