p0131
Moderate
Volkswagen · SUVs
O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1)
Quick Answer
Error code P0131 on your Volkswagen SUVs means: O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1). This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
CAID4ID6B25N5N-LWBCRAtlas Cross Sport SE 2024Atlas Cross Sport SEL 2024Atlas Cross Sport SEL R-Line 2024Atlas SE 2024Atlas SEL 2024Atlas SEL Premium R-Line 2024ID.4 Pro 2024ID.4 Pro S 2024ID.4 Pro S Plus 2024ID.4 Standard 2024Taos S 2024Taos SE 2024Taos SEL 2024Tiguan S 2024Tiguan SE 2024Tiguan SEL 2024Tiguan SEL R-Line 2024
Likely Causes
How to Fix It
1
Monitor the upstream O2 sensor voltage with a scan tool at idle and under load; it should oscillate between 0.1V and 0.9V
2
Inspect the O2 sensor connector and wiring for damage, corrosion, or melted insulation
3
Check for exhaust leaks at the exhaust manifold, downpipe, and sensor bung that could introduce false air
4
Test the O2 sensor heater circuit by measuring resistance across the heater element pins
5
Replace the upstream O2 sensor if it is sluggish, stuck low, or has a failed heater circuit
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Upstream O2 sensor (Bank 1 Sensor 1)
O2 sensor wiring pigtail
Exhaust manifold gasket
Anti-seize compound for sensor threads
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