P2192 System Too Rich At Higher Load Bank 1
OBD-II Trouble Code Technical Description
System Too Rich At Higher Load Bank 1
What does that mean?
This generic powertrain/engine diagnostic trouble code typically applies to fuel injected engines from most European and Asian manufacturers since 2010.
Those manufacturers include but are not limited to Volkswagen, Audi, Mercedes, BMW/Mini, Hyundai, Mazda, Kia and Infiniti.
This code is mostly concerned about the value provided by the air/fuel ratio sensor, more commonly called an oxygen sensor (located in the exhaust) which helps the vehicle’s PCM (powertrain control module) control the amount of fuel being injected into the engine. Specifically, the PCM is detecting a lean condition which means too much air in the air/fuel ratio. This code is set for Bank 1, which is the bank of cylinders that includes cylinder number 1. This can be a mechanical or an electrical circuit fault, depending upon vehicle manufacturer and fuel system.
Troubleshooting steps may vary depending upon manufacturer, type of fuel system, type of mass airflow sensor (MAF) and wire colors and type of air/fuel ratio sensor/oxygen sensor (AFR/O2) and wire colors.
Symptoms
Symptoms of a P2192 engine code may include:
Malfunction Indicator Lamp (MIL) illuminated Lack of power Occasional misfire Poor fuel economyCauses
Potential causes for this code to set are:
Faulty air/fuel ratio sensor/oxygen sensor (AFR/O2) Faulty mass airflow sensor (MAF) Rarely - faulty Powertrain Control Module (PCM)Diagnostic and Repair Procedures
A good starting point is always to check for technical service bulletins (TSB) for your particular vehicle. Your issue may be a known issue with a known fix put out by the manufacturer and can save you time and money during diagnosis.
First, note if there are any other diagnostic fault codes. If any of them are fuel/fuel system related, diagnose them first. Misdiagnosis has been known to occur if a technician diagnoses this code before any fuel related system codes have been thoroughly diagnosed and dismissed.
Next, locate both the air/fuel ratio sensor/oxygen sensor and the mass airflow sensor on your particular vehicle. Here is an example of a MAF sensor:
Once located, visually inspect the connectors and wiring. Look for chafing, rubbing, bare wires, burn spots or melted plastic. Pull the connectors apart and carefully inspect the terminals (the metal parts) inside the connectors. See if they look corroded, burnt or possibly green in color versus the normal metal color you are probably used to seeing. You can get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed. If this is not possible, find some 91% rubbing alcohol and a light plastic bristle brush to clean them with. Afterwards let them air dry, get some dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and put some where the terminals come into contact.
If you have a scan tool, clear the diagnostic trouble codes from memory, and see if this code returns. If it does not, then the connections were most likely your problem.
If the code does return, we will need to test the MAF sensor voltage signal to the PCM. Monitor MAF sensor voltage on your scan tool. If a scan tool is not available, then test the signal coming from the MAF sensor with a digital volt ohm meter (DVOM). With the sensor connected, the red voltmeter lead should be attached to the MAF sensor signal wire and the black voltmeter lead connected to ground. Start the engine and monitor the MAF sensor input. As engine RPM is increased, the MAF sensor signal should increase. Check the manufacturer’s specifications, as there may be a chart informing you of what the voltage should be at a given RPM. If it fails this test, repla
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