Lexus P117B Code

When your Lexus throws a code P117B, it often means that the Direct Injector Fuel Performance needs to be assessed. It is important to understand the underlying causes and develop solutions to prevent the code from appearing again. A P117B code occurs when certain DTCs (Diagnostic Trouble Codes) are not present, such as codes related to the OCV Bank 1, 2, VVT System, Exhaust OCV, Exhaust VVT, and VVT System misalignment. Other codes that can be present are related to the A/F Sensor Heater, MAF Meter, ECT Sensor, TP Sensor, Insufficient ECT, CKP Sensor, VVT Sensor, Igniter, Exhaust VVT Sensor, and Vehicle Speed Sensor. It is also necessary that the fuel system is in the closed loop and the battery voltage is above 11 V. Furthermore, one of two conditions needs to be met: either the engine RPM is less than 1100 rpm or the engine load is 10% or more. Finally, the catalyst monitor should not have been executed.

Causes and Solutions of P117B Code

Cause Solution
Injector for port injection Check for loose wires, and replace as necessary
Injector for direct injection Replace any damaged injectors
Fuel pressure Check fuel pressure and replace fuel pump, if necessary
ECM Update the ECM software if needed

Injectors for Port Injection

The Lexus P117B Code usually occurs when there is an issue with the injectors for port injection. These injectors are responsible for delivering fuel to the engine, and when they are loose, they can cause the code to appear. To inspect the injectors, it is important to check the wiring and connections and replace any that are damaged or loose.

Injectors for Direct Injection

Another possible cause of the P117B Code is an issue with the injectors for direct injection. If the injectors are damaged, they will not be able to provide adequate fuel delivery, which can result in the code showing up. If this is the case, it is important to replace the damaged injectors as soon as possible.

Fuel Pressure

The P117B Code may also be caused by an issue with the fuel pressure. This can occur when the fuel pump is not working properly, or if there is a blockage in the fuel line. To fix this, it is necessary to check the fuel pressure and replace the fuel pump if needed.

ECM Software

The ECM (Engine Control Module) is responsible for monitoring and controlling the engine. If the ECM software is outdated, it can cause the P117B Code to appear. To resolve this issue, it is important to update the ECM software if necessary.


When the Lexus P117B Code appears, it is important to assess the underlying causes and develop solutions to prevent it from occurring again. Potential causes can be related to the injectors for port or direct injection, fuel pressure, or the ECM software. By inspecting the wiring and connections, replacing any damaged injectors, checking the fuel pressure and replacing the fuel pump, and updating the ECM software, the P117B Code can be fixed and prevented in the future.

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