P121B Possible Causes
- Faulty Fuel Injector
- Fuel Injector harness is open or shorted
- Fuel Injector circuit poor electrical connection
How do I fix code P121B
Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
Cost of diagnosing the P121B code
Labor: 1.0The cost of diagnosing the P121B code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
P121B Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P121B MeaningThe Powertrain Control Module (PCM) monitors the Fuel Injector. The PCM sets the OBDII code when the Fuel Injector is not to factory specifications.
P121B More InformationNeed more information on how to fix the P121B code?
Get Access to Factory Service Manuals
P121B Information for specific makes
- P121B FORD Cylinder Balance Test Injector Blocked