Having problems with your 2004 Mazda Tribute ?

Po304 have error code of po304 and po136. check engine light is on a slightly rough idle.

Posted / edited by AnonymousUser on : 06-07-2020

Answers :

PO304--- Possible Bad Ignition Coil on cylinder #4

PO136-- O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)

Could be sensor or wiring or misfire or other items

You should have changed the front or upstream O2 sensors
on all your vehicles at 100,000 miles

The coil code may or may not be correct
You have to diagnose cylinder misfires

I would suggest a repair shop & they have to use a scan tool
in Mode #06 on a road trip of at least 20 miles, to check for
cylinder misfire counts or use an oscilloscope on a road test

If replacing the coil on #4 resolves the issue, it was just luck,
& luck only goes so far

I had a coil in June that no professional test equip found
I had to walk a new one one cyl at a time
Repair Help & Product Troubleshooting for 2004 Mazda Tribute

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