Over sensitive sensors?

[Ben]

I don't use my car very often, I seem to be suffering from the petrol 'going off' - the symptoms being that the ECU light comes on until I'm nearly out of fuel ... once I refill the car with 'fresh petrol' within a few miles the ECU goes off and everything is fine, come back two weeks later of inuse on comes the ECU light.

The error code that I got before was

16556/P0172/000370
16556/P0172 - System Too Rich, Bank 1

Any ideas? .. is there a part I can replace?

[Stuart]

This is a similar thing to the problem Rob had; think it was down to a coil pack with his Ben, but you'd need to check with him to be sure (different symptoms but the same ECU code IIRC)

[Ben]

Ahh, oddily enough it does occasionally suffer from a stutter which I thought maybe coilpacks - will chuck on a new set during the week as a test