P1130: How to Diagnose & Fix — Air/Fuel Ratio Sensor Circuit Range/Performance Malfunction, Bank 1 Sensor 1
2 vehicles · 1 makes
How to diagnose and fix P1130: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Audi Q5 · 2009–2025
Audi states that contaminated gasoline or gasoline with insufficient deposit-control additives can contribute to deposits on intake valves, the intake manifold, fuel injectors and combustion chambers. Possible results include rough running after cold start, extended cranking, hesitation, rough idle, reduced performance, poor fuel economy or an MIL with misfire, lean-system or air/fuel-ratio-imbalance faults. The bulletin does not describe a Q5 intake-valve defect, a walnut-blasting interval or a fixed failure mileage.
Common Symptoms
- Rough running after a cold start
- Excessive engine cranking time
- Hesitation while driving
- Rough idle
- Reduced engine performance
- Poor fuel economy
- MIL with misfire, lean-system or air/fuel-ratio-imbalance faults
How to Fix
Confirm the exact gasoline-powered vehicle, fuel quality, symptoms and stored DTCs before cleaning or replacing components. If contaminated gasoline is suspected, change fuel source; if detergent quality is suspect, Audi recommends Top Tier detergent gasoline. Continue guided diagnosis if the condition persists and identify the actual deposit location before selecting any cleaning procedure. The bulletin does not call for routine walnut blasting, a catch can, chemical cleaner or high-RPM driving.
Sources for this issue (1)
Audi SQ5 · 2014–2025
Audi states that contaminated gasoline or gasoline with insufficient deposit-control additives can contribute to deposits in injectors, combustion chambers, the intake manifold and intake valves, with rough running, hesitation, reduced performance, poor fuel economy or related ECM faults. This does not establish a universal SQ5 intake-valve defect, a mandatory walnut-blasting interval or a fixed mileage. Audi separately warns that unapproved fuel additives are not permitted on 2018-2025 EA839 V6 TFSI SQ5 models because a negative effect on engine life cannot be ruled out.
Common Symptoms
- Rough running after a cold start
- Excessive engine cranking time
- Hesitation while driving
- Rough idle
- Reduced engine performance
- Poor fuel economy
- MIL with misfire, lean-system or air/fuel-ratio imbalance faults
How to Fix
Confirm fuel quality, symptoms and stored DTCs before replacing or cleaning components. If contaminated gasoline is suspected, advise changing the fuel source; if low detergent quality is suspected, Audi recommends Top Tier detergent gasoline. Continue workshop diagnosis if symptoms persist. On 2018-2025 EA839 SQ5 models, do not use unapproved cleaners or additives; follow the owner manual and use only Audi-approved petrol additives. On 2014-2017 supercharged SQ5 models, Audi's bulletin allows its gasoline additive G 001770A2 to remove existing injector and combustion-chamber deposits. Routine walnut blasting or a catch can is not part of Audi's guidance.
Sources for this issue (2)
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P1130 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
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 vary widely depending on the root cause and vehicle.
Which vehicles are affected by P1130?
Au7o has documented P1130 across 2 vehicle models from 1 manufacturers: Audi.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.