TuningBot DTC Database · v4.37.15
Manufacturer-specific interpretation for Lexus. All interpretations of P1438
The control module detected that the signal in the HC catalytic converter, variable valve circuit stayed below the expected operating range. This is the manufacturer-specific definition used by Lexus.
Powertrain: engine, transmission and driveline systems.
Manufacturer-defined range: the meaning can differ between brands.
Specific fault index within the subsystem.
HC catalytic converter, variable valve - circuit low. The control module detected that the signal in the HC catalytic converter, variable valve circuit stayed below the expected operating range. This is the manufacturer-specific definition used by Lexus.
P1438 is a manufacturer-specific code. In this database it is documented for: Lexus. The same number can mean something different on other brands.
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
Understand the system behind this code: Oxygen Sensors (Lambda)
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