SammyBug Posted Monday at 08:21 PM Share Posted Monday at 08:21 PM Hi my engine management light isnt illuminated at engine start up, it's failed it's MOT due to high co2 emissions and inop mil light, dad's run an obd reader and it says p0420, can anyone help as I need get this light working, we've took instrument panel out and there's no signs of tape on led or any tampering, we are at a loss Quote Link to comment Share on other sites More sharing options...
unofix Posted Monday at 08:53 PM Share Posted Monday at 08:53 PM Hello Samantha, what engine have you got ? does the airbag warning light come on at start-up and then go out ? P0420 is a very basic generic code and the cause could be many things. You need to use the software FORScan to see if there are any Ford specific codes. In the time you have owned the car, have you ever seen the EML on at start-up ? 1 Quote Link to comment Share on other sites More sharing options...
nicam49 Posted Monday at 09:00 PM Share Posted Monday at 09:00 PM Hi, you'll also need to fix the high CO² emissions too! Start by taking out the air filter and looking at the underneath of it -(that's the side that gets dirty) you'll be surprised how many ppl neglect to check/change the air filter. Quote Link to comment Share on other sites More sharing options...
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