check engine code with P153 code on 1997 Mazda B4000

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

by in Saint Johns, FL on June 20, 2011
1 answer 2 comments
ANSWER by , 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...
COMMENT by , June 21, 2011
the light went out today, don't know what to think. thanks for your reply.
COMMENT by , 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 is marginal 12-14?