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Engine code po304 - 2008 Mazda Cx 7

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Posted on Jan 02, 2017

SOURCE: po304

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

Posted on Oct 06, 2012

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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

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