Fault code P1196 – a step-by-step guide to diagnosing and fixing it

Error code P1196 is displayed and the check engine light is on - what does this mean?

The DTC P1196 is recognized by the OBD system if there is a problem with the lambda sensor or the fuel-air mixture in the first cylinder bank. This manufacturer-specific trouble code mainly relates to engine management and exhaust gas purification. The exact definition of the EOBD code P1196 may vary slightly for different vehicle manufacturers.

What causes can this error code have?

• Defective lambda sensor (bank 1, sensor 1)
• Contaminated or damaged lambda sensor
• Defective mass air flow sensor
• Leaking intake system
• Blocked fuel injection valves
• Defective fuel pump
• Damaged cable connections to the lambda sensor
• Loose plug connections on the oxygen sensor
• Defective engine control unit
• Dirty air filter
• Leaks in the exhaust system

What symptoms occur in parallel with error code P1196?

• Increased fuel consumption: The vehicle consumes significantly more fuel than usual
• Uneven idling: The engine runs unevenly or jerks when stationary
• Loss of power: Noticeable reduction in engine power when accelerating
• Black smoke: Dark exhaust fumes from the exhaust, especially when accelerating
• Starting problems: Difficulty starting the engine, especially in cold weather
• Check engine light: Steady on or flashing warning light in the dashboard

How to fix the problem of fault code P1196?

• Repairing fault code P1196 requires a systematic diagnosis and appropriate measures.
• Replace lambda sensor bank 1 sensor 1 completely and have it recalibrated
• Clean mass air flow sensor or replace completely if defective
• Check the intake system for leaks and replace damaged hoses/seals
• Have fuel injectors professionally cleaned or replace defective injectors
• Replace the fuel pump and fuel filter together if there are pressure problems
• Check wiring harness to lambda sensor for damage and repair defective lines
• Read out engine control unit, carry out software update or replace if defective
• Replace the air filter and clean the intake tract thoroughly
• Check exhaust system for leaks and seal damaged areas