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Lexus ES350 P2197, P0356, C1201 to P0051: How to Fix Check Engine Light and Permanent Code Erasure

Model: Lexus ES350 Fault Code: C1201 Posted: 2019-02-14 13:29

Hello! I recently had my Lexus ES350 diagnosed with several trouble codes: P2197, P0356, and C1201. The mechanic replaced the engine coil, and after the service, all warning lights initially disappeared. However, after driving for some time, the check engine light, VSC warning, and skid control symbol reappeared. A scan revealed code P2197. The technician advised me to clear the code repeatedly, stating it would eventually resolve itself. This worked temporarily — the code disappeared today — but now I'm seeing a persistent P0051 code that returns immediately after clearing. I'm looking for reliable solutions to permanently eliminate this code and get all dashboard warnings turned off. Any insights into what might be causing this issue or how to fix it effectively?

Related fault codes

C1201P0051P0356P2197

Comments (2)

Anonymous 2019-02-14 15:01

P0051 refers to the heater circuit B2S1 fault. Possible causes include: - A short in the heater circuit of the oxygen sensor - A failed O2 sensor heater element - Damaged or frayed wiring and connectors between the sensor and relay - A malfunctioning Powertrain Control Module (PCM) or Engine Control Module (ECM) For detailed troubleshooting steps, refer to official sources: https://www.autozone.com/p0051-oxygen-sensor-heater-circuit-b2s1

Anonymous 2019-02-15 10:03

Lexus vehicles, being part of the Toyota group, use an A/F Ratio Sensor instead of a traditional O2 sensor. While functionally similar, they differ in design and calibration. If testing confirms the sensor is faulty, it's recommended to replace it with an OEM part from the dealership rather than using aftermarket components to ensure compatibility and accurate performance.