This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.
P1130 is an OBD-II Code that refers to Air/Fuel Ratio Sensor Circuit Range/Performance Malfunction Bank 1 Sensor 1
A P1130 code is a manufacturer specific diagnostic trouble code that occurs with Toyota, Lexus and related makes and vehicles when the ECM/PCM detects a problem with the Air/Fuel Ratio Sensor Circuit. A sensor that measures the amount of oxygen in the exhaust gas produces a voltage based on this. The PCM (Powertrain Control Module) can use this information to make short-term fuel adjustments to keep the air-fuel ratio within acceptable limits for excellent exhaust system performance. An air/fuel ratio sensor, on the other hand, is based on a voltage difference between two independent measuring elements, allowing for the maintenance of a stoichiometric mixture.
The fault code P1130 OBDII will be displayed if the PCM detects voltage out of range on the A/F Sensor in the signal output circuit.
Common causes for this code include:
- Electrical issue with the throttle position sensor circuit
- Vacuum leaks
- Faulty mass air flow sensor
- Faulty air/fuel ratio sensors
- Bad Fuel pressure
- Bad Fuel injector
- Contaminated or faulty oxygen sensor
- Exhaust leaks
The symptoms of a P1130 code are:
- Illuminated Check Engine Light
- Rough Idle
- Reduced Fuel Economy
- Power loss
- Lean Running Condition
- Vehicle may not pass emission tests
To diagnose a P1130 DTC code, a technician would:
- Scan for codes in the ECM and look at the freeze frame data for failure.
- Visually inspect all related wiring and connectors for signs of damage or loose connections.
- Check for vacuum leaks at all possible locations.
- Inspect the air filter and mass air flow sensor for signs of contamination.
- Test the throttle position sensor, fuel pressure and fuel injectors for proper operation.
- Check for exhaust leaks at all possible locations.
The following are some of the most common mistakes that a technician may make when diagnosing a P1130 code:
- Not thoroughly inspecting all the wiring and connectors for damage or loose connections.
- Failing to check for vacuum leaks at all possible locations.
- Not checking the air filter and mass air flow sensor for signs of contamination.
- Not testing the throttle position sensor, fuel pressure and fuel injectors for proper operation.
- Failing to check for exhaust leaks at all possible locations.
How serious is this?
A P1130 code is a fairly serious code that can lead to reduced fuel economy, power loss and a lean running condition. If the vehicle is not repaired in a timely manner, it may fail emissions tests and cause damage to the catalytic converter.
What repairs can fix the code?
The following are solutions that may fix this problem:
- Broken or faulty wirings must be repaired or replaced as needed
- Leaks must be repaired
- Faulty sensors must be replaced
- Bad fuel injectors must be replaced
- Bad fuel pressure regulator must be replaced
A P1130 is related to and may be accompanied by the following codes:
In conclusion, the P1130 code is a diagnostic trouble code that refers to a problem with the Air/Fuel Ratio Sensor Circuit. This code is usually caused by an electrical issue with the throttle position sensor circuit, a vacuum leak, a faulty mass air flow sensor, or a faulty air/fuel ratio sensor. The symptoms of this code include an illuminated check engine light, rough idle, reduced fuel economy, power loss, and a lean running condition. If the vehicle is not repaired in a timely manner, it may fail emissions tests and cause damage to the catalytic converter.