A model-specific diagnostic approach
Begin by identifying the exact chassis, engine, transmission and options. Record when the problem occurs, preserve freeze-frame data and perform a full relevant module scan. Distinguish mechanical, electrical, hydraulic and software causes through direct testing rather than replacing the component named by a code.
Manufacturer-specific considerations
A research case or technical bulletin may identify a possible diagnostic path, but it is not proof that a particular customer's vehicle has the same fault.
Repair confirmation
Verify the repair by reproducing the original operating conditions and confirming no related faults return.
The source research addresses Range Rover applications described as 2015 (Range Rover L405). The correct testing depends on the exact year, engine, drivetrain and equipment.
Symptoms an owner may notice
P2188/P2190 rich-at-idle faults persisted after extensive prior parts and software work.
MIL with both banks rich at idle.
Codes documented in the research include P2188, P2190. A code indicates a monitored condition and is not proof that one particular component failed.
What diagnosis involves
A careful assessment starts by confirming the complaint, reviewing all relevant control-module faults, checking battery and electrical supply where appropriate, and testing the affected system.
Documented causes and repair decisions
In the researched cases, identified causes included Faulty high-pressure fuel pump. A different vehicle with the same symptoms may have a different underlying problem.
Reported successful repairs in the research included Replace high-pressure fuel pump. These are external case outcomes, not claims that Mich’s performed those specific repairs.
Some attempted repairs were ineffective or temporary, including Replace bank-1 upstream oxygen sensor — unsuccessful; Replace bank-2 upstream oxygen sensor — unsuccessful. That is one reason to verify the failure before replacing components.
If your Range Rover has a similar symptom, contact Mich’s Foreign Cars in Hickory, NC at 828-324-6012. Share the model year, engine, exact warning messages and the conditions when the problem occurs.