[al10berto]

Hello.
After replacing the lambda sensor twice (sensor 1, bank 1), I'm experiencing the P2196 error again. Both times, I had it replaced at an authorized repair shop (the second time under warranty). When the warning light appears on the dashboard, the only thing I notice is increased fuel consumption. Aside from replacing the sensor at the repair shop, I only replaced the spark plugs, which were slightly black.
Has anyone had a similar problem or have any idea what could be causing this problem?