New Ford Focus owner here and new forum member.
A couple of weeks ago I bought a 2003 Ford Focus Ink. Sadly the engine management light illuminated after a couple of days of driving. Using the self-diagnostic check in the LCD display showed a DTC code of 9318 (low voltage) had been logged. The battery voltage without the engine running showed as being around 10 volts and 13.5 with the engine running.
I replaced the battery with a new Halfords calcium one (as per their website suggestion for my registration number) and the engine management light was no more. Sadly 100 miles later and the engine management light has illuminated again. The self-diagnostic check shows a DTC code of 9318 and a battery voltage of 11.8 without the engine running and 13.5 with the engine running.
Please could someone help me to further diagnose why the engine management light has illuminated again when the battery and alternator appear to be healthy (to my untrained eye at least)?
Many thanks in advance,