P1272 MAZDA – Cylinder #2 High to Low Side Open

P1272 MAZDA Possible Causes

  • Faulty fuel injector
  • Faulty fuel injector interface module
  • Fuel injector harness is open or shorted
  • Poor electrical connection in the fuel injector circuit

How is the P1272 MAZDA code repaired?

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

Possible Symptoms

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

P1272 MAZDA Meaning

A fault is detected by the fuel injector interface module in the secondary (rear) fuel injector circuit

P1272 NISSAN – Air Fuel Ratio Sensor 1 Bank 1 Circuit No Activity Detected

P1272 NISSAN Possible Causes

  • Faulty Air/Fuel Ratio (A/F) Sensor 1, Bank 1
  • Air/Fuel Ratio (A/F) Sensor 1 Bank 1 harness is open or shorted
  • Air/Fuel Ratio (A/F) Sensor 1 Bank 1 circuit poor electrical connection

How is the P1272 NISSAN code repaired?

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

When is the code detected?

The A/F signal calculated by the ECM from the A/F Sensor 1 signal is constantly approx. 0V.

Possible Symptoms

  • Engine Light On (or Service Engine Soon Warning Light)
  • Possible rough engine idle

P1272 NISSAN Meaning

The A/F sensor is a planar dual-cell limit current sensor. The A/F sensor sensing element is the combination of a Nernst concentration cell (sensor cell) with an oxygen pump cell, which transports ions. It has a heating element in the element.
The sensor is capable of accurately measuring λ=1, but also in the lean and rich range. With its control electronics, the sensor emits a clear and continuous signal over a wide λ range (0.7 < λ < air).
The exhaust gas components diffuse through the diffusion gap at the oxygen pump electrode and the Nernst concentration cell, where they are brought to thermodynamic equilibrium.
An electronic circuit controls the pump current through the oxygen pump cell so that the composition of the exhaust gases in the diffusion gap remains constant at =1. Therefore, the A/F sensor is capable of indicating the air/fuel ratio by this pumping current. Additionally, a heating element is built into the sensor to ensure the required operating temperature of 700 to 800 C (1,292 to 1,472 F).

P1272 TOYOTA – Fuel Pressure Regulator Circuit

🔍 Potential Causes of P1272 Code

  • Clogged fuel filter

  • Leak in the fuel supply system

  • Faulty pressure regulation valve

  • Damaged pressure regulation valve wiring (cut or short-circuited)

  • Poor contact or electrical connection at the regulation valve

  • Faulty fuel injector

  • Defective engine control module (ECM)

🛠️ How to Fix P1272 Code on a TOYOTA Vehicle?

  1. Start by examining the potential causes listed above.

  2. Perform a thorough visual inspection of the wiring and connectors related to the injection system.

    • Look for signs of wear: broken, bent, pushed back, or corroded pins.

    • Ensure all connectors are properly secured and in good condition.

  3. Test the components one by one, starting with the fuel filter and the pressure regulation valve.

🚨 Common Symptoms

  • Engine warning light illuminated on the dashboard (Check Engine)

⚙️ Meaning of P1272 Code

This code relates to pressure regulation in the common injection rail.

  • When cold, the pressure is managed by the rail’s pressure regulation valve.

  • When hot, this task is handled by the intake regulation valve located on the fuel pump.

  • Under low engine load, both valves work together to stabilize the pressure.

  • During rapid deceleration, the ECM (engine control module) commands the valve to open to prevent overpressure.

  • The P1272 code is recorded when the ECM detects that the pressure in the rail does not meet the manufacturer’s specified values.

P1273 – Air-Fuel Ratio Sensor 1 Bank 1 Shift Monitoring

P1273 Possible Causes

  • Faulty Air/Fuel Ratio (A/F) Sensor 1 Bank 1
  • Air/Fuel Ratio (A/F) Sensor 1 Bank 1 Harness is Open or Shorted
  • Air/Fuel Ratio (A/F) Sensor 1 Bank 1 Circuit Poor Electrical Connection
  • Fuel Pressure
  • Faulty Fuel Injector
  • Faulty Mass Air Flow Meter

How is the P1273 Code Repaired?

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

When is the Code Detected?

The A/F signal calculated by the ECM from the A/F Sensor 1 signal is shifted to the lean side for a specified period.

Possible Symptoms

  • Engine Light On (or Service Engine Soon Warning Light)
  • Possible Rough Engine Idle

P1273 Meaning

The Air/Fuel Ratio (A/F) sensor is a planar dual-cell limit current sensor. The sensor element of the A/F sensor is the combination of a Nernst concentration cell (sensor cell) with an oxygen pump cell, which transports ions. It has a heating element within the element.
The sensor is capable of accurately measuring λ=1, but also in the lean and rich ranges. With its control electronics, the sensor emits a clear and continuous signal over a wide λ range (0.7 < λ < air).
The exhaust gas components diffuse through the diffusion gap at the oxygen pump electrode and the Nernst concentration cell, where they are brought to thermodynamic equilibrium.
An electronic circuit controls the pump current through the oxygen pump cell so that the composition of the exhaust gases in the diffusion gap remains constant at =1. Therefore, the A/F sensor is able to indicate the air/fuel ratio by this pumping current. Additionally, a heating element is integrated into the sensor to ensure the required operating temperature of 700 to 800 C (1,292 to 1,472 F).

P1273 NISSAN SENTRA – Air-Fuel Ratio Sensor 1 Bank 1 Shift Monitoring

P1273 2002 NISSAN SENTRA Possible Causes

  • Faulty Air/Fuel Ratio (A/F) Sensor 1 Bank 1
  • Air/Fuel Ratio (A/F) Sensor 1 Bank 1 Circuit Wiring Open or Shorted
  • Air/Fuel Ratio (A/F) Sensor 1 Bank 1 Circuit Poor Electrical Connection
  • Fuel Pressure
  • Faulty Fuel Injector
  • Faulty Mass Air Flow Meter

How is the P1273 2002 NISSAN SENTRA Code Repaired?

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

When is the Code Detected?

The A/F signal calculated by the ECM from the A/F Sensor 1 signal is shifted to the lean side for a specified period.

Possible Symptoms

  • Engine Light On (or Service Engine Soon Warning Light)
  • Possible Rough Engine Idle

P1273 2002 NISSAN SENTRA Meaning

The Air/Fuel Ratio (A/F) sensor is a planar dual-cell limit current sensor. The sensor element of the A/F sensor is the combination of a Nernst concentration cell (sensor cell) with an oxygen pump cell, which transports ions. It has a heating element within the element.
The sensor is capable of accurately measuring λ=1, but also in the lean and rich ranges. With its control electronics, the sensor emits a clear and continuous signal over a wide λ range (0.7 < λ < air).
The exhaust gas components diffuse through the diffusion gap at the oxygen pump electrode and the Nernst concentration cell, where they are brought to thermodynamic equilibrium.
An electronic circuit controls the pump current through the oxygen pump cell so that the composition of the exhaust gases in the diffusion gap remains constant at =1. Therefore, the A/F sensor is able to indicate the air/fuel ratio by this pumping current. Additionally, a heating element is integrated into the sensor to ensure the required operating temperature of 700 to 800 C (1,292 to 1,472 F).

P1273 ACURA – Accelerator Pedal Position Sensor 1-3 Correlation

P1273 ACURA Possible Causes

  • Faulty accelerator pedal position (APP) sensor
  • Accelerator pedal position harness is open or shorted
  • Poor electrical connection in accelerator pedal position circuit

How is ACURA code P1273 repaired?

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

When is the code detected?

The Engine Control Module (ECM) compared the signal from the two accelerator pedal position (APP) sensors and detected a voltage difference.

Possible Symptoms

  • Check Engine Light on (or Service Engine Soon warning light)

P1273 ACURA Meaning

The accelerator pedal position (APP) sensors are located in the throttle actuator control (TAC) module assembly. The TAC module assembly is mounted on the accelerator pedal bracket. There are 3 individual APP sensors in the TAC module. Three separate signal circuits, low reference circuits, and 5-volt reference circuits are used to determine the accelerator pedal position. The APP sensor signal voltages increase when the accelerator pedal is pressed.

P1273 BUICK – Accelerator Pedal Position Sensor 1-3 Correlation

P1273 BUICK Possible Causes

  • Faulty accelerator pedal position (APP) sensor
  • Accelerator pedal position harness is open or shorted
  • Poor electrical connection in the accelerator pedal position circuit

How is P1273 BUICK Code Repaired?

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

When is the Code Detected?

The Engine Control Module (ECM) compared the signal from the two accelerator pedal position (APP) sensors and detected a voltage difference.

Possible Symptoms

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

P1273 BUICK Meaning

The accelerator pedal position (APP) sensors are located in the throttle actuator control (TAC) module assembly. The TAC module assembly is mounted on the accelerator pedal bracket. There are 3 individual APP sensors in the TAC module. Three separate signal circuits, low reference circuits, and 5-volt reference circuits are used to determine the accelerator pedal position. The APP sensor signal voltages increase when the accelerator pedal is pressed.

P1273 CADILLAC – Accelerator Pedal Position Sensor 1-3 Correlation

P1273 CADILLAC Possible Causes

  • Faulty Accelerator Pedal Position (APP)
  • Accelerator Pedal Position Harness is Open or Shorted
  • Poor Electrical Connection in the Accelerator Pedal Position Circuit

How is the P1273 CADILLAC Code Repaired?

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

When is the Code Detected?

The Engine Control Module (ECM) compared the signal from the two Accelerator Pedal Position (APP) sensors and detected a voltage difference.

Possible Symptoms

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

P1273 CADILLAC Meaning

The Accelerator Pedal Position (APP) sensors are located in the Throttle Actuator Control (TAC) module assembly. The TAC module assembly is mounted on the accelerator pedal bracket. There are 3 individual APP sensors in the TAC module. Three separate signal circuits, low reference circuits, and 5-volt reference circuits are used to determine the accelerator pedal position. The APP sensor signal voltages increase when the accelerator pedal is pressed.

P1273 CHEVROLET – Accelerator Pedal Position Sensor 1-3 Correlation

P1273 CHEVROLET Possible Causes

  • Faulty Accelerator Pedal Position (APP)
  • Accelerator Pedal Position Harness Open or Shorted
  • Poor Electrical Connection in Accelerator Pedal Position Circuit

How is P1273 CHEVROLET Code Repaired?

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

When is the Code Detected?

The Engine Control Module (ECM) compared the signal from the two Accelerator Pedal Position (APP) sensors and detected a voltage difference.

Possible Symptoms

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

P1273 CHEVROLET Meaning

The Accelerator Pedal Position (APP) sensors are located in the Throttle Actuator Control (TAC) module assembly. The TAC module assembly is mounted on the accelerator pedal bracket. There are 3 individual APP sensors in the TAC module. Three separate signal circuits, low reference circuits, and 5-volt reference circuits are used to determine the accelerator pedal position. The APP sensor signal voltages increase when the accelerator pedal is pressed.

P1273 CHRYSLER – A/C Clutch Control Circuit 2 High

P1273 CHRYSLER Possible Causes

  • Faulty air conditioning compressor clutch
  • Air conditioning compressor clutch circuit is open or shorted
  • Poor electrical connection in the air conditioning compressor clutch circuit

How is the P1273 CHRYSLER code repair performed?

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

Possible Symptoms

  • Check Engine Light on (or Service Engine Soon warning light)

P1273 CHRYSLER Meaning

Air Conditioning Clutch Control Circuit 2 Low (TIPM). The Engine Control Module (ECM) has detected an open or short circuit in the AC clutch relay control circuit.