Reference meaning
What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
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A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Scan worksheet →Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P0156H02 / CATALYST MONITOR SENSOR (CMS) CIRCUIT FAILURE) CONTAMINATION
P0156REAR O2 SENSOR-BANK 2
P0156OXYGEN SENSOR CIRCUIT
Manufacturer communications
12Original wording in English
JAGUAR
SITUATION: THE ENGINE MALFUNCTION INDICATOR LAMP (MIL) MAY BE ILLUMINATED. UPON DIAGNOSIS, THE TECHNICIAN MAY FIND DIAGNOSTIC TROUBLE CODES (DTC) RELEVANT TO THE MID-CATALYST AND POST-CATALYST HEATED OXYGEN SENSORS (HO2S) -- P0036, P0037, P0038, P0042, P0043, P0044, P0054, P0055, P0056, P0057, P0058, P0060, P0061, P0062, P0063, …
JAGUAR
"ISSUE: THE CUSTOMER MAY OBSERVE A MIL IN THE INSTRUMENT CLUSTER RELATING TO THE ENGINE SYSTEM (CHECK ENGINE LIGHT) AND ONE OR MORE CODES STORED IN THE PCM RELATING TO HEATED OXYGEN SENSOR (HO2S) IN THE EXHAUST SYSTEM. THE CODE WILL REFER TO A FAULT WITH THE PRE, OR MID, OR POST CATALYST HEATED OXYGEN SENSOR: P0036, P0037, P0038…
LAND ROVER
"ISSUE: THE CUSTOMER MAY OBSERVE A MIL IN THE INSTRUMENT CLUSTER RELATING TO THE ENGINE SYSTEM (CHECK ENGINE LIGHT) AND ONE OR MORE CODES STORED IN THE PCM RELATING TO HEATED OXYGEN SENSOR (HO2S) IN THE EXHAUST SYSTEM. THE CODE WILL REFER TO A FAULT WITH THE PRE, OR MID, OR POST CATALYST HEATED OXYGEN SENSOR: P0030, P0031, P00D1…
JAGUAR
"SITUATION: THE ENGINE MALFUNCTION INDICATOR LAMP (MIL) MAY BE ILLUMINATED. UPON DIAGNOSIS, THE TECHNICIAN MAY FIND DIAGNOSTIC TROUBLE CODES (DTC) RELEVANT TO THE MID-CATALYST AND POST-CATALYST HEATED OXYGEN SENSORS (HO2S) -- P0036, P0037, P0038, P0042, P0043, P0044, P0054, P0055, P0056, P0057, P0058, P0060, P0061, P0062, P0063,…
Check vehicle applicability
27A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Ford | MUSTANG ↗ | 2000 |
| Ford | MUSTANG ↗ | 1999 |
| Ford | WINDSTAR ↗ | 2002 |
| Ford | WINDSTAR ↗ | 2001 |
| Infiniti | Q45 ↗ | 1997 |
| Jaguar | F-TYPE ↗ | 2016 |
| Jaguar | F-TYPE ↗ | 2015 |
| Jaguar | F-TYPE ↗ | 2014 |
Code meaning and manufacturer information
Original wording in English · Historical directory labels; manufacturer applicability has not been established for every entry.
O2 Sensor Circuit Malfunction (Bank 2 Sensor 2)
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.