P1130: Air/Fuel Ratio Sensor Circuit Range/Performance Malfunction, Bank 1 Sensor 1
3 vehicles · 2 makes · $120-$400 repair
Most Reported On
P1130 is an OBD-II diagnostic trouble code meaning “Air/Fuel Ratio Sensor Circuit Range/Performance Malfunction, Bank 1 Sensor 1.” A Toyota/Lexus manufacturer-specific code. The engine control module has decided the upstream air/fuel ratio sensor (the wideband oxygen sensor ahead of the catalytic converter on the cylinder bank containing cylinder #1) is reporting a signal that does not make sense for current operating conditions. Because the ECM leans on this sensor to trim the fuel mixture, the car may idle rough, hesitate, and burn more fuel. Note that other manufacturers use P1130 for unrelated faults - Ford defines it as "Lack of HO2S Switch - Adaptive Fuel at Limit" (Bank 1), so the vehicle make matters here. This code is most commonly reported on 2014-2025 Audi SQ5, 2009-2025 Audi Q5, and 2000-2009 Toyota 4Runner (SR5, Sport, Limited), with repair costs ranging from $120 to $400.
Common Causes
Typical Repair Cost
Based on 3 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
P1130 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
Vehicles Affected (3)
FAQ
What does P1130 mean?
P1130 stands for "Air/Fuel Ratio Sensor Circuit Range/Performance Malfunction, Bank 1 Sensor 1." A Toyota/Lexus manufacturer-specific code. The engine control module has decided the upstream air/fuel ratio sensor (the wideband oxygen sensor ahead of the catalytic converter on the cylinder bank containing cylinder #1) is reporting a signal that does not make sense for current operating conditions. Because the ECM leans on this sensor to trim the fuel mixture, the car may idle rough, hesitate, and burn more fuel. Note that other manufacturers use P1130 for unrelated faults - Ford defines it as "Lack of HO2S Switch - Adaptive Fuel at Limit" (Bank 1), so the vehicle make matters here.
What are the most common causes of P1130?
The most common causes of P1130 are: Failed air/fuel ratio sensor, Bank 1 Sensor 1, Blown A/F sensor heater fuse or failed heater element, Damaged, melted, or chafed sensor wiring near the exhaust, Corroded or loose sensor connector, Exhaust or intake air leak upstream of the sensor skewing its reading, Fuel delivery or injector fault pushing the mixture outside the sensor's expected range, Failed ECM (rare - verify everything else first). The specific cause varies by vehicle.
How much does it cost to fix P1130?
Repair costs for P1130 range from $120 to $400, depending on the vehicle and root cause.
Which vehicles are affected by P1130?
Au7o has documented P1130 across 3 vehicle models from 2 manufacturers: Audi, Toyota.
Sources (4)
- TSBAudi TSB 2014753/13 - Gasoline Quality, Misfire, Lean-System and Deposit Diagnosis
- TSBAudi TSB 2075515/2 - Fuel Additives Not Permitted for EA839 V6 TFSI
- ForumAir-Fuel Ratio (A/F) Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) — Toyota-4Runner.org
- manufacturerAir Fuel Ratio Sensor #89467-60010 / 234-9055 fitment — Toyota Parts
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.