What is the reason for the P0021 intake timing control B2 in the old Teana?
3 Answers
It should be a problem with the variable intake system. Related introduction: It is recommended to try changing the engine oil, as when the oil becomes dirty, the camshaft rotation may not be smooth or timely. Check the engine timing marks. Also, inspect whether the connection wires of the camshaft position sensor are loose. It is advisable to visit a 4S shop and use a decoder to check the data stream. Extension: If no issues are found, consider replacing the ECU. The cylinder in an internal combustion engine is the cavity where the piston is placed. It serves as the track for the piston's movement, where the fuel burns and expands. The cylinder wall also helps dissipate some of the residual heat from combustion, maintaining the engine at a normal operating temperature. Cylinders come in two types: integral and single-cast. Single-cast cylinders are further divided into dry and wet types.
I often help people troubleshoot fault codes for older Teana models. P0021 specifically indicates an issue with the intake timing control group B2, which can stem from various causes. It might be due to a loose or skipped timing chain, causing incorrect camshaft positioning; or the VVT solenoid valve could be clogged with sludge and stuck, affecting valve timing adjustment. Low oil pressure may also prevent the control unit from functioning properly; even a faulty camshaft position sensor or corroded circuit connectors can trigger this code. For diagnosis, first check the oil level and quality—if it's too dirty or low, try changing to fresh oil. Then use an OBD tool to read real-time data and confirm positioning issues. A simple fix might be replacing the solenoid valve, but chain issues require professional repair. Regular maintenance with frequent oil changes helps prevent sludge buildup and premature chain wear. Ignoring it can lead to severe engine shaking or stalling, making repairs more costly and complicated later.
When the old Teana shows a P0021 code, I personally checked the B2 group situation, which is often caused by a malfunction in the intake system's timing control. First step, check the engine oil—use the dipstick to measure the oil level. If it's black or insufficient, change it immediately, as dirty oil can clog the VVT components. Second, inspect the sensor connector on the right cylinder group for looseness, clean any rust, or reinsert it. Third, test the functionality of the VVT solenoid valve. If there's abnormal noise or it fails to regulate airflow, replace it. Chain skipping is common in aging vehicles—avoid disassembling it yourself to prevent damage to other parts. It's recommended to visit a shop for a computer scan to pinpoint the exact fault, saving unnecessary expenses. Avoid high-speed driving before repairs to reduce engine load. Remember to check the engine condition monthly during regular use and address minor issues early.
