P1172 Suzuki - Lambda Controller Limit Malfunction Bank 1 Too Lean

Lambda Controller Limit Malfunction Bank 1 Too Lean. The control module detected that the air-fuel mixture stayed leaner than the target despite full corrective control (Lambda Controller Limit Malfunction Bank 1). This is the manufacturer-specific definition used by Suzuki.

P1172 is a manufacturer-specific code. In this database it is documented for: Suzuki. 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.