Hey there, hoping someone out there can help with my issue. I have a 2000 Mazda Protege 1.6, and I've recently had some idling issues. I replaced the battery last Friday (which needed to happen) and replaced one of the connections to the battery. Since then, the idling has been rough. Any idea where I should be looking to solve this?

I should note, I did check the air filter while I was under the hood, so it's possible I didn't get a solid seal or that I bumped the air intake hose...or that might have nothing to do with it, I'm not sure.

 

Ok, I've got more information, helping to supplement the vague first post.

Went to Autozone, came back with code P0171.

Probable causes listed:
1) If bank one and two codes set together suspect fuel pressure or Mass Air Flor Sensor
2) Oxygen senor defective
3) Ignition misfire-repair
4) Fuel injector problem

I'm guessing start with the intake hose, move to the oxygen sensor. Any insight from someone who might know more than myself?

Nevermind, after searching P0171, I see this is somewhat common, no need to reply.

 

had same prob with 2001 protege. check hose running from air box to intake manifold. mine was cracked (from age).prob cleared up instantly and CEL code P0171 went away !!!!!