P1159 HONDA – Air/Fuel Ratio Sensor 1 AFS + Low Voltage Terminal

P1159 HONDA Possible Causes

  • Faulty Air/Fuel Ratio Sensor 1
  • Air/Fuel Ratio Sensor 1 harness is open or shorted
  • Poor electrical connection in the Air/Fuel Ratio Sensor 1 circuit

How to Fix Code P1159 HONDA?

Start by checking the “Possible Causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

When is the Code Detected?

A malfunction is detected and the code is stored if the heater element is not activated or if the voltage at the Engine Control Module (ECM) terminals is a specified value or less for at least a defined period when power is supplied to the A/F sensor heater (sensor 1).

Possible Symptoms

  • Check Engine Light On (or Service Engine Soon Warning Light)

P1159 HONDA Meaning

The Air/Fuel Ratio (A/F) Sensor 1 is installed in the exhaust system and detects the oxygen concentration in the exhaust gases. The A/F sensor sends the output voltage to the Engine Control Module (ECM). A heating element for the sensor element is built into the A/F sensor (sensor 1). It is activated and heats the sensor to stabilize and speed up the detection of oxygen concentration by controlling the current flowing through the heater. The current increase stabilizes when the voltage applied to the element electrode reaches a certain range because the amount of oxygen that passes through the diffusion layer is limited. The current amperage is proportional to the oxygen concentration in the exhaust gases, so the air/fuel ratio is detected by measuring the current amperage. The ECM compares a preset target air/fuel ratio with the detected air/fuel ratio and controls the fuel injection timing.
If the A/F sensor (sensor 1) voltage is low, the air/fuel ratio is lean and the ECM uses A/F feedback control to issue a Rich command. If the A/F sensor (sensor 1) voltage is high, the air/fuel ratio is rich and the ECM uses A/F feedback control to issue a Lean command.

P1159 HYUNDAI – Variable Intake Engine Malfunction

P1159 HYUNDAI Possible Causes

  • Faulty variable intake motor
  • Variable intake motor wiring harness is open or shorted
  • Poor electrical connection in the variable intake motor circuit

How to Fix P1159 HYUNDAI Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Check Engine Light on (or soon-to-be service engine warning light)

P1159 HYUNDAI Meaning

The Variable Intake System (VIS) is used to increase low-end torque and boost power at higher RPM. The 3.5ℓ Sigma engine has two intake ports for each cylinder. The main intake port is a long, thin tube through which intake air passes. This allows a strong airflow to blow into the cylinder, thereby promoting low-end torque. The secondary intake port is a short, wide tube. This allows a large volume of air to be drawn into the engine, thus increasing high-end power. At lower RPMs, the engine does not provide enough suction in the cylinders, thereby depriving the engine of much-needed oxygen. The narrow tube helps blow air into the cylinder for more oxygen. At higher RPM, the engine has plenty of suction, but the intake port is too small to provide the oxygen it needs.

P1159 JEEP – Incorrect Starting Attempt

How to fix JEEP code P1159?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine light on (or engine service warning light soon)

P1159 JEEP Meaning

The Engine Control Module (ECM) detected an engine speed above 100 RPM without the activation of the starter relay control.

P1159 KIA – Variable Intake Engine Malfunction

P1159 KIA Possible Causes

  • Faulty variable intake motor
  • Variable intake motor wiring harness is open or shorted
  • Poor electrical connection in variable intake motor circuit

How to Fix P1159 KIA Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Check engine light on (or service engine soon warning light)

P1159 KIA Meaning

The Variable Intake System (VIS) is used to increase low-end torque and boost power at higher RPM. The 3.5ℓ Sigma engine has two intake channels for each cylinder. The primary intake channel is a long, thin tube through which intake air passes. This allows a strong airflow to blow into the cylinder, thus promoting low-end torque. The secondary intake channel is a short, wide tube. This allows a large volume of air to be drawn into the engine, thereby increasing high-end power. At lower RPMs, the engine doesn’t provide enough suction in the cylinders, thus depriving the engine of much-needed oxygen. The narrow tube helps blow air into the cylinder for more oxygen. At higher RPM, the engine has plenty of suction, but the intake channel is too small to provide the oxygen it needs.

P1159 MINI – Fuel Adaptation Additive, Bank 1

P1159 MINI Possible Causes

  • Air leaks
  • Faulty mass air flow (MAF) sensor
  • Faulty oxygen sensor, bank 1
  • Low fuel pressure
  • Faulty spark plugs
  • Faulty fuel injectors

How to Fix P1159 MINI Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Check engine light on (or service engine soon warning light)

P1159 MINI Meaning

Short-term fuel trim (STFT) is a value that indicates how the engine control module (ECM) adjusts the factory-programmed fuel map. The fuel map is a lookup table that the controller references. This is used to determine the correct amount of fuel to inject. This amount depends on the speed and load conditions monitored on the vehicle. The (STFT) value changes based on the fuel map weighting cell the engine is operating under in terms of speed and load conditions.
The oxygen sensor is a key element in calculating fuel trim. If the oxygen sensor indicates a lean mixture, the (STFT) will be increased above the typical value. If the oxygen sensor indicates a rich mixture, the (STFT) will be reduced below the typical value. Under normal operation, fuel trim values will vary between a maximum of 10% and -10%. (STFT) values that exceed this range should be investigated.

P115A – Low Fuel Level – Forced Limited Power

P115A Possible Causes

  • Low fuel level
  • Faulty fuel level sensor
  • Fuel level sensor harness is open or shorted
  • Poor electrical connection in fuel level sensor circuit
  • Faulty instrument cluster

How to Fix Code P115A?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Technical Notes

Verify there is sufficient fuel in the tank. Check the fuel level sensor and circuits. If no faults are detected in the circuits, install a new fuel level sensor. Clear all codes and test for normal operation.

Possible Symptoms

  • Engine light on (or service engine soon warning light)

P115A Meaning

Fuel level information is sent from the instrument cluster to the Powertrain Control Module (PCM) on the communication link. If a low fuel level input message is received by the PCM from the instrument cluster, the PCM limits the Fuel Rail Pressure (FRP) and sets the DTC P115A.

P115A BMW – Mass or Volumetric Air Flow A Maximum Exceeded

P115A BMW Possible Causes

  • Faulty mass air flow sensor
  • Mass air flow sensor harness is open or shorted
  • Poor electrical connection in the mass air flow sensor circuit

How to Fix BMW P115A Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine light on (or service engine soon warning light)

P115A BMW Meaning

The mass air flow must be within a valid range under all engine operating conditions. The diagnostic function compares the air mass calculated from the model with the measured air mass. A malfunction is detected when the mass air flow falls below or exceeds a calibrated minimum or maximum respectively for a calibrated period of time.

P115A FORD – Low Fuel Level – Forced Limited Power

P115A FORD Possible Causes

  • Low fuel level
  • Faulty fuel level sensor
  • Fuel level sensor harness is open or shorted
  • Poor electrical connection in fuel level sensor circuit
  • Faulty instrument cluster

How to Fix Code P115A FORD?

Start by checking the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Technical Notes

Verify there is sufficient fuel in the tank. Check the fuel level sensor and circuits. If no fault is detected in the circuits, install a new fuel level sensor. Clear all codes and test for normal operation.

Possible Symptoms

  • Engine light on (or service engine soon warning light)

P115A FORD Meaning

Fuel level information is sent from the instrument cluster to the Powertrain Control Module (PCM) via the communication link. If a low fuel level input message is received by the PCM from the instrument cluster, the PCM limits the Fuel Rail Pressure (FRP) and sets the DTC P115A.

P115A LAND-ROVER – Low Fuel Level – Forced Limited Power

P115A LAND-ROVER Possible Causes

  • Low fuel level
  • Faulty fuel level sensor
  • Fuel level sensor harness is open or shorted
  • Poor electrical connection in fuel level sensor circuit
  • Faulty instrument cluster

How to Fix Code P115A LAND-ROVER?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Technical Notes

Check that there is sufficient fuel in the tank. Inspect the fuel level sensor and circuits. If no faults are detected in the circuits, install a new fuel level sensor. Clear all codes and test for normal operation.

Possible Symptoms

  • Engine light on (or service engine soon warning light)

P115A LAND-ROVER Meaning

Fuel level information is sent from the instrument cluster to the Powertrain Control Module (PCM) via the communication link. If a low fuel level input message is received by the PCM from the instrument cluster, the PCM limits the Fuel Rail Pressure (FRP) and sets the DTC P115A.

P115A MINI – Mass or Volumetric Air Flow Rate Maximum Exceeded

P115A MINI Possible Causes

  • Faulty mass air flow sensor
  • Mass air flow sensor harness is open or shorted
  • Poor electrical connection in the mass air flow sensor circuit

How to Fix P115A MINI Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding cable harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine light on (or engine service warning light soon)

P115A MINI Meaning

The mass air flow must be within a valid range under all engine operating conditions. The diagnostic function compares the air mass calculated from the model with the measured air mass. A malfunction is detected when the mass air flow falls below or exceeds a calibrated minimum or maximum respectively for a calibrated period of time.