Diagnosis: It is important to complete the entire diagnostic process when diagnosing the Ford P0128 code. This DTC can be triggered by a missing or stuck open thermostat, a faulty coolant temp sensor, or damaged wiring to the coolant temp sensor circuit. 3rd most common cause of a check engine light in Ford Focus models
IIRC few of the instrument cluster codes are of much use. Reading codes through the OBD connection give you ones that will help more in std. format. Test mode data is often useful for monitoring/checking without tools, best use of this trick.
Check for other diagnostic trouble codes accompanying the P0234 or check appropriate and available PIDs related to above possible causes. P0243 - Supercharger (Boost) Bypass Solenoid Circuit Malfunction The PCM monitors the supercharger (boost) bypass (SCB) solenoid circuit for an electrical failure.
If the trouble code P0193 does not return immediately, this indicates the possibility of an intermittent issue. Intermittent problems may need to get worse before a proper diagnosis can be made. If the car will not start, there is a possibility that there is no fuel in the fuel tank. Use a fuel pressure gauge to test the fuel pressure.
1. Loose ABS Speed Sensor Wiring. Loose or damaged wiring is a very common reason for problems with the ABS system. Minor damage to the speed sensor can cause the ABS system to activate when it doesn’t need to and this can cause the ABS warning light to flash on but not register as a fault with the ECU.
Using an odometer. Making use of the odometer is another way to retrieve the OBD2 codes. The user is required to depress the vehicle’s odometer. (The “reset” and “trip” buttons must be
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how to check ford focus fault codes
