You can find information about the P1111 fault code on this page.
BE WARNED! This particular code can mean a different thing depending on what make the car is, check below.
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Detailed Manufacturer-Specific Explanations
Jaguar – OBD Checks Complete Since Last Memory Clear
For Jaguar, P1111 means that the onboard diagnostic (OBD) tool has determined that all systems operate properly at the end of the diagnostic cycle.
A drive cycle for Jaguar consists of 10,000 revolutions of the motor. This code is logged whenever no issues are detected during every five of these cycles.
This code should not be considered a fault code as it does not represent any issue with the vehicle. It is simply a check that Ford-Jaguar implemented in various models.
See generic codes: There are no similar codes for this manufacturer-specific code
Audi – Oxygen Control (Bank 1) System Too Lean
For Audi, P1111 is logged when the powertrain control module (PCM) has detected that the oxygen control sensor has detected that the system is running too lean.
“Running lean” is a term used to describe an engine where the air-fuel mixture has too much air and not enough fuel. This ratio is typically 14.7 parts of air to every 1 part of fuel.
This can have a vast array of detrimental effects when it comes to vehicle driveability.
Unfortunately, there is also a long list of potential causes for this issue. Almost anything can upset the air-fuel ratio which will cause this code.
Bank 1 simply refers to the side of the engine in which the first cylinder is found. This is used to help pinpoint any potential causes for the issue.
BMW – Engine Coolant Temperature Radiator Outlet Sensor Low Input
For BMW vehicles, P1111 indicates an issue with the engine coolant temperature. This happens when the powertrain control module has detected a signal from the engine coolant temperature radiator outlet sensor that is too low.
A low signal from any sensor can indicate that the sensor is not functioning correctly.
The engine coolant temperature sensors are put in place to continuously check the coolant temperature in the engine. It is necessary for the vehicle’s computer to monitor the temperature of the engine coolant to prevent overheating from occurring.
This fault code can quickly lead to overheating if it is not fixed.
See generic codes: P0117
Hyundai – Intake Air Temperature Sensor – Circuit Low Input/ Intermittent
For Hyundai, fault code P1117 indicates that there is a malfunction with the intake air temperature (IAT) sensor. This code is logged when the signal from the sensor to the powertrain control module is either too low or unexpectedly losing signal intermittently.
The IAT sensor is used to monitor the temperature of the air entering the engine. This information is sent to the PCM to determine various optimizations of the air-fuel mixture entering the combustion chamber.
Without proper information, the PCM cannot accurately alter the mixture. This can cause driveability issues like increased fuel consumption and rough running.
This can be a result of an engine that is running too rich or too lean. These terms are used to describe an engine with an air-fuel mixture that has too much fuel or too much air respectively.
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