?s about the O2 sensor

[hdsalinas]

I posted about this on another thread (which is slowy sinking down somewhere) but I think that i might have to replace the oxigen sensor on my corolla.

I am noticing a sharp increase in fuel consumption and although the car idles and runs fine I have noticed that when I accelerate hard (ej. crossing a intersection) it feels somewhat slow like if it was "loaded" with people.

I have talked with a friend and we both came to the conclusion that it might be the o2 sensor but I am not fully convinced because I dont get a "check engine" light. Can the oxigen sensor be bad even if the check engine light does not show a problem?

Fuel economy is very important for me here in Honduras since we pay US$2.88 per gallon. Right now my car is making like 17mpg. So fixing this problem is a high priority for me.

[OEMonkey]

am noticing a sharp increase in fuel consumption and although the car idles and runs fine I have noticed that when I accelerate hard (ej. crossing a intersection) it feels somewhat slow like if it was "loaded" with people.

when you go WOT, o2s input is ignored and your in open loop. maybe your misfiring on acceleration or maybe your clutch is slipping, could be a lot of things. diagnostics is about making sure,not guessing. so run some test and inspection and I'm sure you'll find the problem.

[hdsalinas]

I did some test today. I found out that the PCV valve is clogged. I replace it tomorrow.