P2190

Code

LAND ROVER P — Powertrain

System very rich in inactive bank 2

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 13 EN: 281 RU: 27

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Page language: EN

Causes

Faulty or contaminated upstream oxygen sensor (Bank 2)
Shorted or damaged wiring/connectors to Bank 2 O2 sensor or injectors
Leaking or stuck-open fuel injector(s) on bank 2
High fuel pressure (failed fuel pressure regulator or restricted return)
Fuel rail leaking or dripping onto exhaust/manifold
Mass air flow (MAF) sensor fault or contamination (incorrect airflow input)

Symptoms

Illuminated MIL (Check Engine Light)
Poor fuel economy (high fuel consumption)
Black smoke from exhaust or rich fuel smell (gas smell)
Rough idle, hesitation or reduced engine performance
Fouled spark plugs on cylinders of bank 2
Failed emissions test

What to check

Retrieve trouble codes and freeze-frame data with a capable scan tool
Record live data: bank 2 O2 sensor voltages (upstream and downstream) and switching behavior
Check short-term and long-term fuel trims for both banks (STFT/LTFT)
Inspect wiring and connectors for Bank 2 O2 sensor and injectors for damage, corrosion or shorting
Fuel pressure test at the rail with a gauge (compare to spec)
Visually inspect injectors for external leaks and listen for proper injector operation

Signal parameters

Bank 2 upstream O2 voltage: normally toggles ~0.1–0.9 V; a sustained >0.7–0.8 V indicates very rich
Bank 2 downstream O2: should be more stable but not constantly high (>0.8 V)
Short-term fuel trim (STFT) Bank 2: large negative values (e.g., < -10% to -25%) indicate commanded leaning to compensate for rich condition
Long-term fuel trim (LTFT) Bank 2: persistent negative LTFT (e.g., < -10%) supports rich condition diagnosis
Fuel rail pressure: compare to vehicle spec (commonly ~40–60 psi gasoline systems; refer to OEM spec)
MAF airflow (g/s) or voltage: compare to expected at idle / given RPM

Diagnostic algorithm

Read and record DTCs, freeze-frame and live data (O2 voltages, STFT/LTFT, fuel pressure, MAF).
Visually inspect wiring/connectors for Bank 2 O2 sensors and injectors; repair any damage. Check sensor harness pins and grounds.
Compare Bank 1 vs Bank 2 O2 sensor behavior using live data. If Bank 1 is normal and Bank 2 is biased rich, focus on bank 2 circuit/components.
Backprobe Bank 2 upstream O2 sensor: verify heater circuit and sensor signal at key engine conditions. Replace sensor if heater/signal out of spec.
Perform fuel pressure test at idle and under load. If pressure is above spec, inspect fuel pressure regulator and fuel return. Repair or replace as needed.
Inspect injectors on bank 2: perform injector balance/flow test or swap suspect injectors with bank 1 (if applicable) to see if fault follows injector. Replace leaking/stuck injectors.
Clean or test MAF sensor and verify intake air values. Replace if faulty and consistent with rich symptoms.
Check for fuel leaks (rail, injector O-rings) that could allow fuel dripping into intake or onto hot components.
After repairs, clear codes and perform a road/drive cycle to verify code does not return and trims normalize.
If no hardware fault found, check PCM software level and consult OEM service information/TSBs; as last resort consider PCM diagnostics or replacement.

Likely causes

Bank 2 upstream O2 sensor failure or contaminated sensor
Leaking or stuck-open injector(s) on bank 2
Excessive fuel pressure from failed regulator or fuel pump
Wiring or connector short on bank 2 sensor circuit

Fault status

⚠️ Status

P2190 — System Very Rich Inactive Bank 2: PCM detected an excessively rich air/fuel condition on bank 2 and set MIL. Investigation of bank 2 O2 sensor, fuel delivery and wiring is required.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

Repair manuals

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P2190 — System very rich in inactive bank 2