laloquera916

Just got done installing my boy'z cylinder head and cleared the error codes so they can recirculate, no dice, the same error codes come up like a with in a minute:
p0325 knock sensor
p020 catalyst
p1164 02 sensor
p1259 vtec malfunction
p1456 evap

I most of missed a sensor, will start with the knock sensor and work my way up. If you have any positive insight, do get at pronto.
Thanks

lazlong

Missed a connector? Are your grounds good? There's 1 from the engine block to the radiator support and 1 behind each fender.

laloquera916

Lucky me, the knock sensor was broken. Replace it & Im down to one error code, the dreaded p420.
Anyone?, Im not replacing the cat!

lazlong

Google "spark plug defouler trick".

MAD_MIKE

Recheck your valve adjustment, if the exhaust valves are too tight they can cause a misfire or catalyst threshold efficiency code. If the piston tops had some carbon build up then it may just be the new head/sparkplugs are burning off some excess carbon from the piston tops. It should clear up in abut 100miles.