I am getting the above fault code P0266 No2 cylinder contribution/balance what does it mean and is it serious? The car is running really smoothly either under power or tick over.
exvolvoman
Active Member
This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model. The OBD II trouble code P0266 is described as a cylinder number 2 contribution/balance. In essence, this code is stating that the number two cylinder in the firing order is experiencing a fuel-related problem. This is also a generic code, meaning it is common to all manufacturers. The reference is the same, however, the manufacturer of a specific model may have experienced a defective part or error in installation. Always access the technical service bulletins (TSBs) online for your specific year and make vehicle. Look for related TSBs and the factory recommended repair procedure. The powertrain control module (PCM) monitors the power output from each cylinder by comparing the acceleration or increase in speed of the crankshaft during the power stroke of each cylinder. When one or more cylinders are contributing less power than the rest of the cylinders, the fault code P0266 is set. While the PCM performs this test to determine if a fuel injector is working properly, an auto technician can perform a similar test to locate internal engine problems. By pulling one spark plug at a time while the engine is running, he notes the RPM drop on each cylinder. All the cylinders must be within 5-percent of each other. Any cylinder showing a lesser drop in RPM is in need of repair. Both tests are similar in that they both compare crankshaft RPM. This is a problem that must be addressed at your earliest convenience to prevent any possible damage from occurring.
