The check engine light has been on intermittently for a while. When the light is on, the engine 'hunts' on idle but still drives fine. If I unplug the battery, the light will go off for maybe 1 or 2 trips but then come back on. While it's off, it idles fine but when on it will hunt again on idle.

I've pulled the CEL code by jumping the diagnostics plug and counting the CEL flashes. It's fault code 8 which I believe is TDC (Top Dead Centre) sensor.

Has anyone had this error before on a Jazz and fixed it?

What I've tried already:

• New Cam Sensor
• New Crank Sensor
• New Spark plugs (they were due anyway)
• Cleaned out the EGR
• New oil and oil filter (this was due as well)

I read that this error is sometimes caused by timing being out due to a stretched chain but don't want to go down the route of chain replacement unless it's 100% the cause as that's a much bigger job!

I also read on some older Honda's the TDC sensor is inside the distributor but the GD1 Jazz ignition is ECU and Coil controlled so no distributor. Could it be a dud ECU or coil?

Any suggestions appreciated.
Cheers
L