Hi guys since fitting a new panel airfilter from halfords my car has been rich - using a lot of fuel, more then what it used to do. Any reason why? It's a fabia 2000 1.4 mpi comfort

Thanks Sean

Suggest you reset the ECU by disco'ing the battery and see if it improves.

Okay thanks if that doesnt work what else could you suggest?

Okay thanks if that doesnt work what else could you suggest?

 

I'll wait for your report on the outcome of that piece of simple and practical advice, I'll leave the speculation to others if you don't mind.

I would like to ask first, how did you diagnose the car?

 

Resetting the car would be a good idea. I would clean up the map sensor, the throttle body, and O2 sensor and look for vacuum leaks in the way.

 

If it was not fixed, I would look at the fuel pump and fuel filter/regulator.

I would like to ask first, how did you diagnose the car?

 

Because the only thing the OP did was replace the air filter, so he manually changed the AFR, the ECU then needs more time in closed-loop to re-adapt to the changed AFR, by reloading the default base map you shortcut a lot of that running time. There's no reason to assume anything else is wrong with the car at this stage since it was running fine before the filter change.