Mazda 323f 1.5 BA question!

OwlsZat

Quick Question on an NCT failure I just had!

Exhaust Emissions
Low Idle (780 rpm)

CO 0.01 vol% (fail above 0.50%) PASS
HC 14ppm (fail above 0ppm) N/A

High Idel (3,180 rmp)
Lambda 1.24 (limits between 0.97 - 1.03) FAIL
CO 0.01 vol% (fail above 30%) PASS
HC 15 ppm (fail above 200ppm) PASS


These are the results and as you can see, I failed for a high lambda value! From my basic understanding I would assume that the actual lambda sensor in the engine is working because my emissions are good? Is it more likely I have an air leak in the exhaust somewhere which leads to the high lambda value when tested with the exhaust probe? Any opinions on if I am interpreting this correctly would be appreciated, or opinions as to what actually might be wrong?

Cheers

OwlsZat

wrong section?

majnus

First of all, go get it connected to a computer and read the faults off your car, if the lambda fault will show up, simply just replace the sensor, if not - well that could mean anything else like exhaust, converter... Don't really know. My sisters Polo failed on emissions and turned out it was EGR valve, so really, without connecting to a computer you won't know anything...

OwlsZat

Resurrecting this old thread to say, ye there was an air leak in the intake manifold which was sorted with some super glue

Passed, and going grand again.

doOh

thats great xD had one couple years back. Good first car but nothing more :P