Error Code P2191: What It Means & What To Do?

<<See All OBD Codes

The trouble code P2191 can be defined as System Too Lean At Higher Load Bank 1. P2191 error code is mostly concerned about the value provided by the air/fuel ratio sensor which is more generally known an oxygen sensor. It is situated in the exhaust which would help the vehicle’s powertrain control module to control the amount of fuel being injected into the engine. Now if the powertrain control module would detect a lean condition, then it would mean that there is too much air in the air/fuel ratio. This error code is set for Bank 1, which is the bank of cylinders that involves cylinder number 1. There can be sometimes mechanical or issues related to electrical circuit as it all depends upon the manufacturer of the automobile as well as the entire fuel system.

It is always good to learn more! That is the reason why we are here to help you out in gaining more knowledge about the P2191 error code. It is the generic code for the engine control module which would detect that the fuel control has reached its rich limits when the car engine is under load on bank 1.

What causes this problem with the System Too Lean At Higher Load Bank 1?

• There can be inoperative air/fuel ratio sensor/oxygen sensor (AFR/O2)
• Imperfect mass airflow sensor 
• Quirks in the powertrain control module

1. Oxygen Sensor - An oxygen sensor plays a vital role in the fuel delivery system and air to fuel ratio mixing functions. Without this sensor proper combustion of fuel cannot take place, thus causing performance issues. Also the exhaust system will not be able to detect the emissions properly if this sensor becomes inactive, resulting in increased emissions from the exhaust. Thus replace faulty oxygen sensor today!
2. Engine Control Module - There can be some engine performance issues due to faulty engine control module. If the ECM fails or has any problems it can lead to performance issues with the vehicle like misfires, hesitation, loss of power, and sometimes even decreased fuel economy.
3. Fluid Pump Control Module - Faulty fluid pump control module will result in the fluid pump not working properly. This will cause transmission issue and erratic behaviours. Replace faulty control module immediately.
4. Powertrain Control Module - PCM stands for powertrain control module. It is a car part, a control unit which is utilized on motor vehicles. It is generally a combined control unit, consisting of the engine control unit (ECU) and the transmission control unit (TCU).
5. Engine Wiring Harness - Is your car battery losing charge very quickly as well as frequently? Then it is an indication that your car engine wiring harness has some major issues. Get it inspected and replaced as soon as possible.
6. Electronic Control Unit - If your automobile's check engine light remains on constantly, and never goes off, there's a good chance that your vehicle has a damaged electronic control unit. There are a lot of reasons why a car's check engine light will remain on. The most common reason is a defective ECU.
7. Diagnostic Tools - It is always advisable to use correct tools and equipment while resolving any OBD code issue as even small mistakes can lead to wrong diagnosis. Thus, always take help from a professional who has the knowledge and experience to such tools in efficient manner. Buy new quality diagnostic tools from us today!

Our main motive is to achieve customer satisfaction as for us our customers are everything and that’s why we will help you to diagnose P2191 code by mentioning some major symptoms below:

Common Symptoms

• The service engine soon light can start lighting up
• Absence of power
• Irregular misfire
• Decline in the fuel economy

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P2191:

• It is essential to restore one of the injectors for bank one
• Repair or replace the quirky O2 sensor for bank one
• Carefully clean the injectors
• Rehabilitate the defaults in the powertrain control module

However, if you face any issue then we have stocked a wide range of best priced car engine, engine light, powertrain control module, engine control module, air fuel ratio sensor, fuel injection system, fuel pressure, oil pressure sensor, pcm car, air fuel ratio gauge, fuel regulator and more to help you out in fixing your car.

Here are some steps which you should follow in order to diagnose this fault code:

• This is a general type of error code which is diagnosed with the help of a scanner.
• The mechanic will insert a scanner to diagnostic port of the vehicle and recover the codes and freeze frame data.
• If he happens to find any additional error codes, he has to address them as well.
• Once it is done, he has to reset the vehicle, and then test drive to see if the error code appears.
• If the error code does not return, then there can be an erratic condition.
• Then the mechanic has to check the wires, connectors and other electrical components and quickly replace them if he finds them to be damaged or defective.
• Carefully scan the codes and then document the code in the engine control module and then check the freeze frame data for some defects.
• The O2 sensors for bank 1 should be monitored while manually enriching the mixture with propane to see if the O2 sensor indicates rich condition.
• All the spark plugs on bank one of the engine should be removed carefully and then inspect to see which plug is running lean.
• The manufacturer pinpoint tests should be followed properly for diagnosis and then restore the clogged and faulty injector for the lean running cylinder.

Common Mistakes When Diagnosing The P2191 Code

• The technicians might clear the ECM memory codes before actually inspecting the freeze frame data for the main issue, so it is very important to repair the failure.
• Many a times the mechanic might fail to clear the memory codes of the ECM before actually examining the freeze frame data, so make sure to repair the failure.

P2192 - System Too Rich at Higher Load Bank 1