I've got a Fiesta LX 1250 '04, I had it in the garage 2 weeks ago because the engine warning light was on and it was running very rough, they said it was misfiring on one of the cylinders, they put new plugs in and it's been fine, untill today that is, it felt as if it had no power and might stall, it wasn't as bad as before and the light didn't come on this time.

The thing is after the last time, I bought an RAC fault code reader, it's not showing any codes, but has a freeze frame logged with code P0130, the software that came with the code reader says that it's an 'O2 sensor circuit malfunction, bank 1 sensor 1'

Does anyone know exactly what this means? Any help at all will be appreciated.

I've only had the dam car 2 months

I've got a Fiesta LX 1250 '04, I had it in the garage 2 weeks ago because the engine warning light was on and it was running very rough, they said it was misfiring on one of the cylinders, they put new plugs in and it's been fine, untill today that is, it felt as if it had no power and might stall, it wasn't as bad as before and the light didn't come on this time.

The thing is after the last time, I bought an RAC fault code reader, it's not showing any codes, but has a freeze frame logged with code P0130, the software that came with the code reader says that it's an 'O2 sensor circuit malfunction, bank 1 sensor 1'

Does anyone know exactly what this means? Any help at all will be appreciated.

I've only had the dam car 2 months

This is the sensor which is at the front of the engine which is inserted into the exhaust manifold.

more info from > http://www.rac.co.uk/web/forum/showthread.php?t=846

I've got a Fiesta LX 1250 '04, I had it in the garage 2 weeks ago because the engine warning light was on and it was running very rough, they said it was misfiring on one of the cylinders, they put new plugs in and it's been fine, untill today that is, it felt as if it had no power and might stall, it wasn't as bad as before and the light didn't come on this time.

The thing is after the last time, I bought an RAC fault code reader, it's not showing any codes, but has a freeze frame logged with code P0130, the software that came with the code reader says that it's an 'O2 sensor circuit malfunction, bank 1 sensor 1'

Does anyone know exactly what this means? Any help at all will be appreciated.

I've only had the dam car 2 months

Sounds like the Lambda sensor to me, I'm a Alfa Romeo mechanic and half the cars that are running rough usually have faulty Lambda sensors. Not too pricey and quick and easy to replace. Good luck