Emissions warning light

clonagam

The car is a Honda HRV 2005 1.6L petrol engine - odometer 130,000 km.

The "Emissions" dashboard light has come on. Never had this before.

It just passed its NCT in August with readings low idle 730 rpm CO 0.01 vol% and high idle 2,680 rpm Lambda 1.00 CO 0.08 vol%. HC 26 ppm

Is there any first aid DIY procedure that I can do to make it go out prior to taking it to the dealers? e.g. replacing Lambda sensor?

Leonard Hofstadter

Plug it into an OBD diagnostic scanner and find out what the fault codes are. If you've got bluetooth you can get the torque pro app on your phone and an OBDII port for about €10-15 all in.

Without that it is impossible to know what is at fault and hence what the next steps are; it could be something minor and could be left for a while (for example, if it was a post-cat O2 sensor then that has very little bearing on fuel trims so is unlikely to affect the running of the car so it's not that urgent a fix, and depending on the car might not even cause the MIL to come on), or it could be something quite serious and could do a lot of expensive damage if it's not rectified fairly quickly (if it was something like system too lean - extended driving with a code like that will write off the catalytic converter and depending on engine do some engine damage as lean running makes the cylinders hotter).