A failed downstream oxygen sensor (HO2S22) that is stuck at a high voltage or contaminated; A wiring fault in the HO2S22 circuit, such as a short to voltage or a damaged connector; An exhaust leak upstream of the sensor allowing oxygen to enter and skew the reading; A leaking fuel injector on bank 2 causing a genuine rich condition; High fuel pressure from a faulty pressure regulator or restricted return line; A contaminated mass airflow sensor over-reporting airflow and causing excess fuel delivery; A failing catalytic converter that no longer stores oxygen and allows the downstream sensor to stay rich

DTC codes / Jaguar codes / P1158

P1158 · JaguarLack Of HO2S22 Switches Sensor Indicates Rich

Q: What does code P1158 mean?

Lack Of HO2S22 Switches Sensor Indicates Rich. P1158 on a Jaguar means the engine control module has monitored the downstream oxygen sensor on bank 2 (HO2S22) and found that its voltage stays high, indicating a rich exhaust mixture, without the expected switching between lean and rich. The computer sets this code when the sensor signal fails to cross its lean threshold within the calibrated test window, so the sensor is reporting a persistent rich condition rather than normal catalytic converter activity.

P1158 on a Jaguar means the engine control module has monitored the downstream oxygen sensor on bank 2 (HO2S22) and found that its voltage stays high, indicating a rich exhaust mixture, without the expected switching between lean and rich. The computer sets this code when the sensor signal fails to cross its lean threshold within the calibrated test window, so the sensor is reporting a persistent rich condition rather than normal catalytic converter activity.

SystemPowertrain

Code typeJaguar specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
A slight decrease in fuel economy as the engine runs richer than commanded
A faint sulfur or rotten-egg smell from the exhaust in severe cases
Occasional rough idle or hesitation when the mixture is excessively rich
Black or sooty exhaust tailpipe deposits
Failed emissions inspection due to the stored code and rich condition

Common causes, most likely first

A failed downstream oxygen sensor (HO2S22) that is stuck at a high voltage or contaminated
A wiring fault in the HO2S22 circuit, such as a short to voltage or a damaged connector
An exhaust leak upstream of the sensor allowing oxygen to enter and skew the reading
A leaking fuel injector on bank 2 causing a genuine rich condition
High fuel pressure from a faulty pressure regulator or restricted return line
A contaminated mass airflow sensor over-reporting airflow and causing excess fuel delivery
A failing catalytic converter that no longer stores oxygen and allows the downstream sensor to stay rich

How to diagnose and fix it

Connect a scan tool and verify P1158 is current, then check HO2S22 live voltage to confirm it stays above 0.6 volts without switching
Inspect the HO2S22 sensor, connector, and wiring for corrosion, chafing, or a short to voltage, repairing any damage found
Smoke-test the exhaust system upstream of the sensor to rule out leaks that can mimic a rich condition
Check fuel trims and injector balance on bank 2 to identify a leaking injector or excessive fuel delivery
Measure fuel pressure and compare it to the Jaguar specification, replacing the regulator or pump if pressure is too high
Replace the HO2S22 sensor only after electrical and fuel-delivery checks confirm the sensor itself is at fault
Clear the code and complete a drive cycle to verify the monitor runs and P1158 does not return

Why a rich code is not always the sensor

A downstream oxygen sensor that reads rich is often reporting a real fuel-delivery problem on bank 2, so replacing the sensor first can leave the code returning within a few drive cycles.
Exhaust leaks between the manifold and the sensor pull in outside air and can make the sensor switch erratically, which some technicians misread as a lazy sensor rather than a leak.
Jaguar's downstream monitor is sensitive to sensor age, and a sensor with high mileage can become sluggish without setting a heater code, so live voltage switching time is worth checking before condemning it.
A contaminated mass airflow sensor that over-reports airflow will drive both banks rich, but P1158 appears first on bank 2 when that sensor's trim correction is closest to its limit.
The code does not confirm the catalytic converter is failing; a rich-running engine can damage the converter over time, so fixing the root cause protects the converter rather than replacing it.

Can I keep driving with P1158?

You can usually drive the car short distances to a workshop, but avoid hard acceleration and long trips because a persistent rich condition wastes fuel and can overheat the catalytic converter. If the check engine light starts flashing or the car runs rough, stop driving and have it diagnosed promptly.

Tools that help

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Guidance is general and written for Jaguar vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.