The P2196 code is a generic diagnostic trouble code (DTC) defined as the O2 Sensor Signal Stuck Rich (Bank 1 Sensor 1.) This code pertains to the front oxygen sensor (located before the catalytic converter) on Bank 1.
The P2196 fault code is stored by your vehicle’s computer when the front oxygen sensor in Bank 1 detects a rich airfuel ratio (more fuel, less oxygen) in the exhaust manifold.
The front oxygen sensor is responsible for monitoring the air-fuel ratio in the exhaust manifold and transferring the information to the powertrain control module (PCM.) The powertrain or engine control module (ECM) compares this information from the oxygen sensor to the outside air to ensure the engine runs on an ideal air fuel ratio.
If excessive fuel is injected into the combustion chamber, the powertrain control module will log error code P2196.
Here are the most common symptoms associated with the error code P2196:
The fault code P2196 may not necessarily pose immediate drivability issues. However, if left unresolved, it could result in a damaged catalytic converter, purge valve, and decreased fuel efficiency, eventually leading to fatal engine damage.
Typically, the trouble code P2196 will trigger the check engine light on your dashboard. When this happens, it’s best to have your vehicle diagnosed at a reputable repair shop.
Here are some of the most common triggers for trouble code P2196:
Here’s a step-by-step look at how an expert mechanic will go about diagnosing error code P2196:
Common mistakes when diagnosing P2196
Conducting a diagnosis for the P2196 code requires appropriate tools and technical expertise. It also requires the technician to check every component in a step-by-step process. Failing to do so could result in an incorrect diagnosis or perfectly good components being replaced.
Fixing the trouble code P2196 may require repairing and replacing multiple issues and components.
Here are some of the possible repair solutions:
And here are the estimated repair costs for trouble code P2196:
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