Geds

iTrader: (4)

Anyone know what engine mgmt light code P0420 means?

Car 2007 STi hawkeye
Recently mods (past week):
Walbro 255 fuel pump
H&S decat downpipe
Last cat between downpipe and centre pipe left in place
Mods done by Subaru during 4th yr service
Mods done in prep for a remap by JGM scheduled for next Tuesday

Tonight while cruising along at 40 mph steady, engine mgmt light comes on.
Stays on and won't reset after 3 restarts
Queried with Vi monitor which report code "P0420 Unknown"
Light reset with Vi monitor

Anyone know what code P0420 means?

rob84

iTrader: (5)

Catalyst below threshold p0420

recent decat will trigger the fault code, when mapped the code will be erased

Geds

iTrader: (4)

You're a gem mate. Thanks a mil.

AN07 PTN

also turning ignition on and off 5 times will turn the light out for a short period if it bothers you

Geds

iTrader: (4)

Ah - I thought it was 3. I have a Vi monitor which allowed me to reset it. Cheers mate.