# P0171 on the 2018 Jeep Wrangler

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

Nobody has written a description of this code yet.

## Bulletins for this model year that name P0171

- [10223588](https://open.wenmarpro.com/bulletins/10223588), 2022-10-17: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find that one or more of the following DTCs have been set:P2C90 \- Crankcase Ventilation System \- Hose "A" Disconnected\(APAC, EMEA and LATAM Only\). P04FC \- Crankcase Ventilation System Performance\(APAC, EMEA and LATAM Only\). P2453 \- Particulate Filter Pressure Sensor "A" Circuit Range/Performance\(APAC and EMEA only equipped with Gas Particulate Filter \(GPF\). P245F \- Particulate Filter Pressure Sensor "B" Circuit Range/Performance\(APAC and EMEA only equipped with Gas Particulate Filter \(GPF\). P0456 \- EVAP System Small Leak. If DTC P0456 is present use wiTECH Small Leak Verification Test \(SLVT\) to determine if a leak is present in the system. P0171 \- Fuel System 1/1 Lean\(LATAM Only\). P0172 \- Fuel System 1/1 Rich\(LATAM Only\). P0128 \- Thermostat Rationality\(Sales Codes NA1 with NBQ or NB6 Only \- APAC and EMEA Only\). P050B \- Cold Start Ignition Timing Performance\(Sales Codes NA1 with NBQ or NB6 Only \- APAC and EMEA Only\). Customers may comment on one or more of the following:Excessive fan noise when the A/C is on MAX output. Rough idle at engine start up in colder ambient temperatures. Software enhancements also included in this update:Electric Vacuum Pump \(EVP\) update. Fan noise reduction. Low Speed Pre Ignition \(LSPI\) update.
- [10221287](https://open.wenmarpro.com/bulletins/10221287), 2022-09-26: Customer?s complaint may include a MIL\-on with one or more of the following DTCs \(Active, Pending, or Stored\) in the PCM: P0133, P0137, P0171, P0300, P2096. The root cause could be due to oil leaking from Bank 1 valve cover seal on to the 1/2 \(Bank 1 downstream\) O2 sensor. This can adversely affect the 1/2 O2 sensor signal reading and lead to listed DTCs. Before performing normal diagnostic routines for the above codes, check for the condition listed above.
- [10219953](https://open.wenmarpro.com/bulletins/10219953), 2022-09-15: Customer?s complaint may include a MIL\-on with one or more of the following DTCs \(Active, Pending, or Stored\) in the PCM: P0133, P0137, P0171, P0300, P2096. The root cause could be due to oil leaking from Bank 1 valve cover seal on to the 1/2 \(Bank 1 downstream\) O2 sensor. This can adversely affect the 1/2 O2 sensor signal reading and lead to listed DTCs. Before performing normal diagnostic routines for the above codes, check for the condition listed above.
- [10218493](https://open.wenmarpro.com/bulletins/10218493), 2022-08-22: Customer?s complaint may include a MIL\-on with one or more of the following DTCs \(Active, Pending, or Stored\) in the PCM: P0133, P0137, P0171, P0300, P2096. The root cause could be due to oil leaking from Bank 1 valve cover seal on to the 1/2 \(Bank 1 downstream\) O2 sensor. This can adversely affect the 1/2 O2 sensor signal reading and lead to listed DTCs. Before performing normal diagnostic routines for the above codes, check for the condition listed above.
- [10215854](https://open.wenmarpro.com/bulletins/10215854), 2022-07-18: Customer?s complaint may include a MIL\-on with one or more of the following DTCs \(Active, Pending, or Stored\) in the PCM: P0133, P0137, P0171, P0300, P2096. The root cause could be due to oil leaking from Bank 1 valve cover seal on to the 1/2 \(Bank 1 downstream\) O2 sensor. This can adversely affect the 1/2 O2 sensor signal reading and lead to listed DTCs. Before performing normal diagnostic routines for the above codes, check for the condition listed above.
- [10212474](https://open.wenmarpro.com/bulletins/10212474), 2022-05-31: Customer?s complaint may include a MIL\-on with one or more of the following DTCs Active, Pending, or Stored in the PCM: P0133, P0137, P0171, P0300, P2096. The root cause could be due to oil leaking from Bank 1 valve cover seal on to the 1/2 Bank 1 downstream O2 sensor. This can adversely affect the 1/2 O2 sensor signal reading and lead to listed DTCs. Before performing normal diagnostic routines for the above codes, check for the condition listed above.
- [10194053](https://open.wenmarpro.com/bulletins/10194053), 2021-05-24: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find that one or more of the following DTCs have been set:P02EE \- Cylinder 1 Injector Circuit Performance\(APAC, EMEA and LATAM Only\). P02EF \- Cylinder 2 Injector Circuit Performance\(APAC, EMEA and LATAM Only\). P02F0 \- Cylinder 3 Injector Circuit Performance\(APAC, EMEA and LATAM Only\). P02F1 \- Cylinder 4 Injector Circuit Performance\(APAC, EMEA and LATAM Only\). P2C90 \- Crankcase Ventilation System \- Hose "A" Disconnected\(APAC, EMEA and LATAM Only\). P04FC \- Crankcase Ventilation System Performance\(APAC, EMEA and LATAM Only\). P2453 \- Particulate Filter Pressure Sensor "A" Circuit Range/Performance\(APAC and EMEA only equipped with Gas Particulate Filter\(GPF\)\). P245F \- Particulate Filter Pressure Sensor "B" Circuit Range/Performance\(APAC and EMEA only equipped with Gas Particulate Filter \(GPF\)\). P0456 \- EVAP System Small Leak.If DTC P0456 is present use wiTECH Small Leak Verification Test \(SLVT\) to determine if a leak is present in the system. P0171 \- Fuel System 1/1 Lean\(LATAM Only\). P0172 \- Fuel System 1/1 Rich\(LATAM Only\). P0128 \- Thermostat Rationality\(Sales Codes NA1 with NBQ or NB6 Only \- APAC and EMEA Only\). P050B \- Cold Start Ignition Timing Performance\(Sales Codes NA1 with NBQ or NB6 Only \- APAC and EMEA Only\). Customers may comment on one or more of the following:Excessive fan noise when the A/C is on MAX output. Rough idle at engine start up in colder ambient temperatures. The following software enhancements are also included in this update:Electric Vacuum Pump \(EVP\) update. Fan noise reduction. Low Speed Pre Ignition \(LSPI\) update.
- [10187033](https://open.wenmarpro.com/bulletins/10187033), 2021-02-16: Customer's complaint may include a MIL\-on with one or more of the following DTCs \(Active, Pending, or Stored\) in the PCM: P0133, P0137, P0171, P0300, P2096. The root cause could be due to oil leaking from Bank 1 valve cover seal on to the 1/2 \(Bank 1 downstream\) O2 sensor. This can adversely affect the 1/2 O2 sensor signal reading and lead to listed DTCs. Before performing normal diagnostic routines for the above codes, check for the condition listed above.
- [10177533](https://open.wenmarpro.com/bulletins/10177533), 2020-07-27: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find that one or more of the following DTCs have been set:P2C90 \- Crankcase Ventilation System \- Hose "A" Disconnected\(APAC, EMEA and LATAM Only\). P04FC \- Crankcase Ventilation System Performance\(APAC, EMEA and LATAM Only\). P2453 \- Particulate Filter Pressure Sensor "A" Circuit Range/Performance\(APAC and EMEA only equipped with Gas Particulate Filter \(GPF\). P245F \- Particulate Filter Pressure Sensor "B" Circuit Range/Performance\(APAC and EMEA only equipped with Gas Particulate Filter \(GPF\). P0456 \- EVAP System Small Leak. If DTC P0456 is present use wiTECH Small Leak Verification Test \(SLVT\) to determine if a leak is present in the system. P0171 \- Fuel System 1/1 Lean\(LATAM Only\). P0172 \- Fuel System 1/1 Rich\(LATAM Only\). P0128 \- Thermostat Rationality\(Sales Codes NA1 with NBQ or NB6 Only \- APAC and EMEA Only\). P050B \- Cold Start Ignition Timing Performance\(Sales Codes NA1 with NBQ or NB6 Only \- APAC and EMEA Only\). Customers may comment on one or more of the following:Excessive fan noise when the A/C is on MAX output. Rough idle at engine start up in colder ambient temperatures. Software enhancements also included in this update:Electric Vacuum Pump \(EVP\) update. Fan noise reduction. Low Speed Pre Ignition \(LSPI\) update.
- [10175565](https://open.wenmarpro.com/bulletins/10175565), 2020-05-26: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find that one or more of the following DTCs have been set:P0456 \- EVAP System Small Leak.If DTC P0456 is present use wiTECH Small Leak Verification Test \(SLVT\) to determine if a leak is present in the system. P0171 \- Fuel System 1/1 Lean\(LATAM Only\). P0172 \- Fuel System 1/1 Rich\(LATAM Only\). P0128 \- Thermostat Rationality\(APAC\&EMEA with Sales Codes NA1 with NBQ or NB6 Only\). P050B \- Cold Start Ignition Timing Performance\(APAC\&EMEA with Sales Codes NA1 with NBQ or NB6 Only\). Customers may experience:Excessive fan noise when the A/C is on MAX output. Rough idle at engine start up in colder ambient emperatures. Software enhancements include:Electric Vacuum Pump \(EVP\) update. Fan noise reduction. Low Speed Pre Ignition \(LSPI\) update.