Fault code P1141 – a step-by-step guide to diagnosing and fixing it

Error code P1141 is displayed and the check engine light is on - what does this mean?

The DTC P1141 is a manufacturer-specific fault code that is recognized by the OBD/EOBD diagnostics and indicates a problem with the fuel-air mixture or the lambda sensor heater. This trouble code mainly occurs in Ford vehicles and indicates a fault in the mixture control or oxygen sensor heating circuits.

What causes can this error code have?

• Defective lambda sensor heater
• Damaged cable connections to the lambda sensor
• Corroded or loose plug connections
• Defective lambda sensor (oxygen sensor)
• Problems with the engine control unit (ECM/PCM)
• Short circuit in the heating circuit wiring
• Faulty fuse in the lambda sensor heating circuit
• Faulty earth cable
• Soiling or contamination of the lambda sensor

What symptoms occur in parallel with fault code P1141?

• Increased fuel consumption: The vehicle consumes significantly more fuel than usual
• Uneven engine running: The engine runs unevenly, especially when idling
• Starting problems: Delayed starting or difficulty starting the engine
• Exhaust problems: Increased pollutant emissions and odors
• Power loss: Reduced engine power and poor acceleration
• Check engine light: Permanent illumination of the check engine light

How can the problem with fault code P1141 be rectified?

• Correcting fault code P1141 requires a systematic diagnosis of the affected components.
• Check the lambda sensor heater for continuity and correct voltage using a multimeter and replace the entire lambda sensor if it is defective
• Visually inspect all cable connections to the lambda sensor, repair or replace damaged or corroded cables
• Clean plug connections to the lambda sensor, check for tight fit and replace if necessary
• Check fuses in the lambda sensor heating circuit and replace defective fuses
• Read out the engine control unit with an OBD scanner, carry out software updates or replace the control unit if defective
• Check the ground cable of the lambda sensor for corrosion and proper connection and clean or replace if necessary