Would be grateful if anyone can tell me whether the car may have developed a problem or if its just one of those things.
The engine warning light came on a week or so ago, stayed on for a couple of days and then went out. It has now come on again and has stayed on. The code is PO420 which is 'Catalyst Efficiency Below Threshold Bank 1 ' which, according to the internet search means that is not as efficient as the factory is expecting, so either an O2 sensor or cat issue or the factory ECU setting is not quite right. Both times it came on the engine was under a lot of load, I was enjoying myself though!
I have cleared the code and it hasn't come back on again, yet, and the engine is performing normally. This used to happen quite frequently on my previous car, a Black Top Zetec 4/4, which sailed through its MOTs without any problems and performed as it should so I am thinking its just one of those Morgan features but would appreciate any comments from those who know more about this than I do or have had the same fault code on their GDI.
