Fault code P1470 – a step-by-step guide to diagnosing and fixing it

Error code P1470 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system detects a fault in the fuel tank venting system, more specifically a problem with the fuel tank pressure sensor or the tank venting system. This manufacturer-specific DTC mainly affects the EVAP system (Evaporative Emission Control System) and can occur in different vehicle brands with slightly different definitions.

What causes can this error code have?

• Defective fuel tank pressure sensor
• Damaged or clogged vent lines
• Faulty tank ventilation valves
• Loose or corroded plug connections on the pressure sensor
• Defective activated charcoal filter in the EVAP system
• Leaking fuel lines or tank caps
• Electrical problems in the sensor wiring
• Blocked or jammed vacuum lines

What symptoms occur in parallel with fault code P1470?

• Starting problems: The vehicle may be harder to start, especially after refueling
• Fuel smell: Smell of gasoline in or around the vehicle
• Loss of power: Reduced engine power when the tank level is low
• Irregular idling: Engine runs unevenly at idle speed
• Increased fuel consumption: Measurably higher consumption due to inefficient combustion
• Refueling difficulties: Problems refueling or premature shutdown of the fuel nozzle

How can the problem with error code P1470 be rectified?

• The repair requires a systematic diagnosis of the tank ventilation system and the associated components.
• Check the fuel tank pressure sensor and, if defective, replace it completely, including recalibrating the system
• Check all vent lines from the tank to the engine for blockages or damage and clean or replace if necessary
• Dismantle and clean tank vent valves or replace with new original parts
• Check electrical connections on the pressure sensor, clean corroded contacts and repair damaged cables
• Replace the activated charcoal filter in the EVAP system and check the entire system for leaks
• Check fuel tank cap for proper fit and intact seals, replace if necessary
• Test the complete vacuum lines of the ventilation system for continuity and flush out blocked areas