DXcivicHB

I've read all the threads but i'd still like some advice on my specific car.

Heres the readings
ASM2525 TEST
......limit reading
HC ppm 75 13
CO% .42 .00
NO ppm 576 1008 FAIL

I would greatly apprecieate any advice

also under vechile information it says engine size 1.6l i know my car has a d15b7 would this change the limits or readings?

Thanks

czeto

High NOx usually indicates that you need to replace your catalytic converter. Simple as that. There is no magic fluid to put in, or secret screw you can turn to fix it. Your other readings are excellent.

DXcivicHB

Thanks, im going to have someone look at the timing and im going to seafoam it b4 I go buying a new cat. I just replaced the plugs/wires/cap/roto/fuel filter.

sohcnotec

Not really. A lot of convertors are replaced for no reason/incorrect diagnosis.
Chances are some seafoam will help or you could be looking into a 02 sensor, which is the most common cause of etest failure.

FYI: plain tap water sucked through the intake system works as well as any chemical out there. So don't waste your money on that ****.
Those that have seen the inside of a cylinder burning coolant knows how spotless it is.

imported_Dawson

all other readings would be low because nox is high its basically a over heated combustion chamber and o2 sensor is true but in most cases when a car needs a o2 sensor to pass emissions its usually CO`s that are high. thats just my observations working on nisssans all day

but nissans have EGR valves and mass air flow sensors and hondas dont

what do civics have a 3 way catalyst?

there is a "bed" in the cat that aids in lowering NOx though