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Check engine code with P153 code

(1997 Mazda B4000)
in Saint Johns, FL on June 20, 2011
v6 4.0L engine with 105,000 miles. MAF was replaced 3 months ago, it runs fine except for marginal gas mileage. thanks for helping
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Popular Answer
on June 20, 2011
P0153 is bank 2 oxygen sensor issue. Check for air leaks. A diagnostic test needs to be performed to monitor oxygen sensor operation - check bank 2 verses bank 1 - see how they are switching.

It may be that you need a bank 2 upstream oxygen sensor.

This will also hurt your fuel economy...
on June 21, 2011
the light went out today, don't know what to think. thanks for your reply.
on June 21, 2011
Oxygen sensor issues can come and go as drive cycles are continuously being updated, and this kind of code may indeed clear itself in time. Keep a sharp eye - the key to me is that your fuel economy is marginal...which in this truck you're lucky if you hit 15-18 on the highway...so is marginal 12-14?

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