Our woes started following an engine misfire (quite bad and driven for around 50 miles) fixed by replacement coil pack and leads. As soon as we got home after the repair, the EML came on again and has remained on constantly ever since. Error codes and diagnostics by Ford dealer indicate possible fault with sensor or wiring on bank 1 catalytic converter and a defective catalytic converter on bank 2 (below efficiency limits). Apart from the EML being on, the engine seems to be running normally.

Ford suggest that unspent fuel due to the misfire has wrecked the catalytic converter and possibly the upstream sensor(s). Cost to repair - another £1,500.

Have had various alternative suggestions to replacing the converters like applying heat to burn out any residues. Is this a technique worth trying?

It has also been suggested that the car may still pass an MOT emissions test and in this case we could just drive on and ignore the problem. Is this possible and worth investigating? We don't want to go to such great expense unless there is no alternative.

If all else fails, does anyone know of a reputable after-market replacement for the catalytic converters on this model - it seems that the higher output TI/VCT engine has a rather over-complicated setup with twin converters, sensors etc. and the replacement includes the complete manifold. An independent garage has not been able to find one from a trusted source.

Any advice gratefully received.