P0030
Low SeverityHO2S Heater Control Circuit (Bank 1, Sensor 1)
Emissions System
P0030 — Instant Answer
HO2S Heater Control Circuit (Bank 1, Sensor 1)
Severity: LOW SEVERITY
Meaning: The oxygen sensor heater circuit on the upstream (pre-cat) sensor of bank 1 has a fault. The heater gets the O2 sensor to operating temperature quickly for proper fuel trim.
Safe to drive? Usually yes with caution, but confirm root cause before long trips.
Estimated repair cost: $30 - $100
Most common causes:
- 1. Failed O2 sensor heater element (35-45% of cases)
- 2. Blown fuse for O2 heater circuit (10-25% of cases)
- 3. Wiring damage to sensor (10-25% of cases)
- 4. ECM driver circuit failure (5-10% of cases)
Symptoms
- ⚠️Check engine light
- ⚠️Slightly increased fuel consumption
- ⚠️Failed emissions test
- ⚠️Longer warm-up period
Related Symptoms
Common Causes
How to Diagnose P0030
- 1Check O2 heater fuse
- 2Measure heater circuit resistance
- 3Inspect wiring to sensor
- 4Test with scan tool live data
OEM Procedures for P0030
HO2S Heater Control Circuit (Bank 1 Sensor 1) Found 58 OEM service manual procedures.
11 51 000 Removing and installing/replacing the coolant pump (X5 M) - Replacement: Prepare the coolant pump
11 51 000 Removing and installing/replacing the coolant pump (X5 M) - Replacement: Prepare the coolant pump
11 51 000 Removing and installing/replacing the coolant pump (X5 M) - Replacement: Prepare the coolant pump
11 51 000 Removing and installing/replacing the coolant pump (X5 M) - Replacement: Prepare the coolant pump
11 51 000 Removing and installing/replacing the coolant pump (X5 M) - Replacement: Prepare the coolant pump
11 51 000 Removing and installing/replacing the coolant pump (X5 M) - Replacement: Prepare the coolant pump
11 51 000 Removing and installing/replacing the coolant pump (X5 M) - Replacement: Prepare the coolant pump
11 51 000 Removing and installing/replacing the coolant pump (X5 M) - Replacement: Prepare the coolant pump
Showing 8 of 58 procedures
OEM Diagnostic Flowchart
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Parts & Tools for This Job
Common parts shoppers buy for P0030 HO2S Heater Control Circuit (Bank 1, Sensor 1).
Oxygen Sensor
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Catalytic Converter
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EVAP Purge Valve
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Gas Cap
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OBD2 scanner
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Check SpecificationsBattery tester
Check cranking and charging health before replacing expensive parts.
A weak battery can mimic alternator or starter problems.
Check SpecificationsMultimeter kit
Confirm voltage, continuity, and sensor power with one simple kit.
A meter is the cheapest way to rule out a bad circuit fast.
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Related Resources
Repair guides, symptom pages, and wiring diagrams related to P0030.
OEM Manual Evidence
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Diagnostic Trouble Codes (DTC) Index — 2013 Audi A3 Premium, 2.0L Eng VIN E, Automatic DCT Trans Service Manual ~ LEMON Manuals LEMON Manua...
Diagnostic Trouble Codes (DTC) Index — 2013 Audi A3 Premium, 2.0L Eng VIN E, Standard Trans Service Manual ~ LEMON Manuals LEMON Manuals: R...
Diagnostic Trouble Codes (DTC) Index — 2013 Audi A3 Premium, 2.0L Eng VIN E, Standard Trans Service Manual ~ LEMON Manuals LEMON Manuals: R...
Related Symptoms
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Exact Repair Workflows
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Related Codes
The O2 sensor heater circuit voltage is lower than expected on the upstream bank 1 sensor. Usually means an open circuit in the heater element.
The heater in the upstream O2 sensor on bank 1 is not working properly. The heater brings the sensor to operating temperature quickly.
The heater circuit for the downstream (post-cat) O2 sensor on bank 1 has failed. This sensor monitors catalytic converter efficiency.
Frequently Asked Questions
- Can I drive with P0030?
- Yes, it is safe to drive. The only effect is slightly worse fuel economy during warm-up and a failed emissions test.
- How do I fix P0030?
- Check the O2 heater fuse first. If the fuse is good, the O2 sensor heater has failed and the sensor needs replacement.
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Author & Review
Published by AllOEMManuals, founded by Lyndon Bedford, an automotive technician with 20 years of experience. He owned and operated a mechanic shop in Hurst, Texas from 2014 to 2022 and continues hands-on repair work.
Content may combine manual references, general repair templates, and AI-assisted drafting. Confirm the source, vehicle configuration, and applicability before working. Report corrections through our contact page.
Last updated: 2026-10-29