Fuel and injectionGeneric OBD-II codeUrgency: Garage soon

P2191 on Peugeot: causes and affected engines

P2191 means: too lean under high load (bank 1).^[1][2][3] Peugeot has 10 documented faults that can trigger it, across 9 engines, including 1.4 HDi, 1.6 HDi, 1.5 BlueHDi and 1.6 THP. Only a diagnosis can confirm the cause on your car.

Documented faults

that can trigger it

Engines

used by Peugeot, with at least one of them

Peugeot models

with at least one of these faults

Urgency

Garage soon

Reviewed on 31 October 20264 sources How we work

Documented faults in Peugeot engines that can trigger P2191

Grouped by engine or model, from most to least important. These are faults with the fuel pump, of the mass airflow sensor, with the injectors and of the lambda sensor: not all of them will necessarily set the code, and only a diagnosis confirms the cause on your car.

1.4 HDi

In 206, 207 and 1007

- Medium severityFrequency: Very frequentInjectionInjectors that lose their seal and let diesel escapeThe most cited weak point of the 1.4 HDi is its injectors: over time they can lose their seal and let diesel escape, which is usually noticed as a smell of diesel in the car. It appears in the two most common outputs (68 and 70 hp) and in both cases it is identified as the engine's main weakness.

1.6 HDi

In 206, 207, 208 I, 301, 307, 308 I and 7 more models

1.5 BlueHDi

In 208 I, 208 II, 308 II, 308 III, 508 II, 2008 I and 5 more models

- High severityFrequency: OccasionalInjectionSeizure of the high-pressure pump and injection systemSome early 1.5 BlueHDi engines have suffered seizure of the Bosch high-pressure pump, with juddering or the engine stalling on the road, sometimes before 50,000 km. The repair means replacing the entire injection system and the fuel tank.

1.6 THP

In 207, 208 I, 308 I, 308 II, 508 I, 3008 II and RCZ

- Medium severityFrequency: CommonInjectionHigh-pressure fuel pump (HPFP) failure on the turbo versionsThe high-pressure pump that feeds the direct injection of the turbo (THP) versions can fail. MINI, which uses the same block in the Cooper S, extended the warranty on this part in 2010 to 10 years or 192,000 km for 2007-2009 models in the US, without the need for a recall.

2.0 BlueHDi

In 308 II, 508 I, 508 II, 3008 II, 5008 II and Expert III

- High severityFrequency: OccasionalInjectionInjector and high-pressure pump wearThe injectors and the high-pressure pump on the 2.0 BlueHDi are among the documented faults, although in a minority of the cases recorded compared with AdBlue or the DPF. When the pump fails, metal particles can contaminate the whole circuit and make the repair far more expensive.

2.2 HDi

In 406, 407, 607, 807 and 4007

- High severityFrequency: OccasionalInjectionPiezo injector wear and failureThe 2.2 HDi uses third-generation common-rail injection with piezo injectors at up to 1,800-2,000 bar. Fiches-auto documents injector cases across several power outputs, without it being the most repeated fault, with symptoms of hard starting, jerking or higher fuel consumption.

2.2 / 2.4 / 3.2 TDCi (Puma)

In Boxer III

- Medium severityFrequency: OccasionalInjectionFaulty injectors on the 2.2 and 2.4 TDCiHaynes documents faulty injectors on the 115 hp Transit 2.2 and the 140 hp 2.4, and L'argus reports an injector recall on the 2014-2015 Boxer and Jumper 2.2 HDi. They cause rough idle, loss of power or stalling.

1.4 and 1.6 TU3/TU5

In 206, 207, 307 and Partner I

- Low severityFrequency: CommonElectronicsSensors that fail: lambda sensor and temperature sensorThe lambda sensor and the coolant temperature sensor are, along with the coils, the components most cited as faulty: they cause an unstable idle, the engine warning light coming on or a cooling fan that does not behave normally.Appears at around 25,000 km

1.0 VVT-i

In 107 and 108

- Low severityFrequency: OccasionalEmissions controlFaulty lambda sensor (P0420 code) on the 1.0 VVT-iOn the 1.0 VVT-i (1KR-FE) in the Aygo, C1 and 107/108, the lambda sensor, especially the one upstream of the catalytic converter, is documented as failing at high mileage and leaving code P0420 and the engine warning light. It is a cheap repair and does not damage the engine.

Common causes of P2191 on any make

From most to least likely, according to the sources.

1Weak fuel delivery under load: a failing pump, a blocked filter, restricted injectors or a faulty regulator.^[1][2]
2Air entering after the mass airflow meter without being measured: cracked intake hose, loose clamp, vacuum or crankcase ventilation leak, manifold gasket.^[1][2][4]
3Dirty or under-reading mass airflow meter, so the control unit requests too little fuel.^[1][2][4]
4Low or unstable fuel pressure due to a faulty regulator or a partially blocked supply line.^[1][2]

What to check first

The first diagnostic steps, from the most likely and cheapest to check to the most expensive.

1Read the stored and pending codes and the freeze frame data. Watch the short- and long-term fuel adjustments while raising revs and load, and note where the positive peaks occur and at what coolant temperature.^[1]
2Measure the fuel pressure and compare it with the specification; check that it does not drop when demand increases and that it holds for a few minutes after switching the engine off.^[1]
3Look for unmetered air with the engine warm: intake hose, clamps, throttle body and manifold gaskets, and vacuum and crankcase ventilation hoses. Watch the adjustments while pinching the ventilation hose or applying a leak detector, and check that the purge valve holds vacuum.^[1]

Full guide to P2191: symptoms, diagnosis and whether you can drive

Parts related to code P2191 on Peugeot cars

The parts that most often cause this code. The code points to the circuit, not always the part: diagnose before you buy.

Fuel pump
- Buy part at Autodoc (affiliate link, opens in a new tab)
Injector
- Buy part at Autodoc (affiliate link, opens in a new tab)

Affiliate links: if you buy from these shops, MotorFiable may receive a commission at no cost to you. Check compatibility against the registration plate or VIN before ordering. Affiliate links

Frequently asked questions

Which Peugeot engines have faults that can trigger P2191?

1.4 HDi (1 fault), 1.6 HDi (2 faults), 1.5 BlueHDi (1 fault), 1.6 THP (1 fault), 2.0 BlueHDi (1 fault) and 2.2 HDi (1 fault). Each fault has its own page with the affected years and versions, the symptoms and the repair cost.

What does code P2191 mean on a Peugeot?

Too lean under high load (bank 1). The control unit sees that the long-term fuel adjustment of bank 1, in the high-load zone, exceeds its limit. AutoDTCs cites as a reference around +25% sustained for about 90 seconds with the engine fully warm: the control unit has already added the maximum fuel it is allowed and still cannot correct the mixture. It is a generic OBD-II code: it means the same on a Peugeot as on any other make.^[1][2][3]

Can I keep driving with P2191?

Garage soon. AutoDTCs rates it as moderate severity and warns that a lean mixture under load can cause misfires, knocking and heat damage to the pistons and the catalytic converter if the engine is worked hard for a long time. It recommends driving gently and repairing it soon; Samarins includes knocking uphill among the effects of a lean mixture.^[1][4]

Sources

Every fact on this page links to its source. If you find an error, let us know.

P2191 – System Too Lean at Higher Load Bank 1 — AutoDTCsAutoDTCs · Technical documentation · published August 2026 · consulted 31 October 2026
OBD DTC Fehlercode P2191 | System zu mager bei höherer Last - Bank 1CarWiki.de · Technical documentation · consulted 31 October 2026 · in German
p2191 Generic DTC: System Too Lean at Higher LoadDTCSearch.com (OBD Solutions) · Technical documentation · consulted 31 October 2026
Code P0171 - System Too Lean: Symptoms, causes, common problems, diagnosticSamarins.com · Technical documentation · published 10 July 2021 · consulted 31 October 2026