Talk Morgan Forums Morgan Sports Cars Maintenance & Servicing Engine warning light

Have the same problems with my 2010 Roadster Sport 3.0 - as per Morgan dealer my sport exhaust is "too progressive", leading to gases flowing too fast between front and back lambda sonds (left OR right side - bank 1 or 2 of the engine) This creates an error, which does not indicate any real problem, but still it´s irritating as you can´t differentiate from a real engine problem. As Heinz stated, I also bought an OBD2 reader (around 60 Euro), with which you can also reset the onboard unit. The common errors with my Roadster are 153 and 154 - which are neglectable and can be reset. Feel free to contact me if you need any more details...

PS: the problem can occur more often when a) you park the car in the sun, leading to higher pressure in the tank, and thus overflow of gases into the combustion/emission track (emission mixture too "rich"), and/or b) "topping" the fuel tank and manually adding more fuel than the automatic of the petrol pump nozzle does, thus leading to a "too full" tank (see a.)
I also noticed that with higher age of my Roadster, this happens more often (even after replacing the lambda sonds).

Marcel, I found buying branded super fuel solved the 153 & 154 codes. I think cheaper fuels blind the Lambda sensors.

@John, will try, thanks - I normally buy branded only and the higher quality (E5 instead of E10), but never tried the 100 octane, as they are even much more expensive.
I also forgot code 133, which is currently the most often error thrown - but this seems to be connected to the sport exhaust system ("slow reaction"). Exhaust has no leaks, sensors have been replaced - similar errors reported by owner who has same exhaust. As long as it´s only a reset away, I´ll prefer the phenomenal sound over replacing any parts of the exhaust system :-)

Mine would only do it in the winter and on the passenger side generally when stopping when warm for a short period such as a refuel.