What does code P0172 mean on a Land Rover and is it safe to drive?
P0172: System Too Rich (Bank 1). Here's what it means on your Land Rover, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
PowertrainMedium urgency
What this code means
Too much fuel relative to air. O2 sensor detects low oxygen in exhaust; PCM is reducing fuel trim.
Common causes for your Land Rover
- Faulty MAF or O2 sensor
- Leaking fuel injector(s)
- High fuel pressure
- Faulty purge valve stuck open
Symptoms
- Check Engine Light
- Rich smell, black smoke
- Poor fuel economy
- Rough idle possible
Typical fixes
- Replace MAF or O2 sensor
- Test fuel pressure and injectors
- Replace purge valve if stuck open
Repair cost range
For a Land Rover, repairs for P0172 often fall between $100 and $600, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Land Rover
Land Rover P0172 bank 1 rich condition on the 5.0L AJ V8 is often a leaking injector O-ring or a failed fuel pressure regulator. On 2.0T Ingenium, a stuck-open EVAP purge valve or a failed MAP sensor are more common causes of over-fueling.
Most commonly affected models
Range Rover 3.0L V6 2013–2020Range Rover Sport 5.0L V8 2010–2020Discovery Sport 2.0T 2015–2022