P0035
Fix within 1-2 weeksThe heater circuit for your Bank 1 Sensor 3 oxygen sensor is drawing too much electrical current.
Code P0035 means your Bank 1 Sensor 3 oxygen sensor heater circuit has a high electrical current. Common causes: Faulty O2 sensor (80%), wiring issues (15%). Drivability: Yes, safe to drive. Repair cost: $50-$300 DIY, $200-$600 professional.
Can I Drive With P0035?
Yes, safe to drive
No restrictions, but fix within 1-2 weeks to restore fuel economy and emissions performance.
Stop driving immediately if: Flashing CEL, loud noises, burning smell, rotten egg smell, significant power loss
Symptoms of P0035
- 1Check Engine Light is on
- 2Reduced fuel economy
- 3Engine may run rough at idle (less common)
- 4Increased exhaust emissions
Common Causes of P0035
Parts most likely causing this code, ranked by probability
The heater element inside the oxygen sensor has an internal short, causing it to draw excessive current.
80% of P0035 cases are fixed by replacing this part
The wiring leading to the oxygen sensor is damaged or shorted to power or ground, causing a high current draw.
15% of P0035 cases are fixed by repairing the wiring
The engine computer itself has an internal fault and is incorrectly controlling the oxygen sensor heater circuit.
5% of P0035 cases are fixed by replacing the ECM/PCM
Check These First (Before Buying Parts)
- Visually inspect the Bank 1 Sensor 3 oxygen sensor and its wiring harness. Look for any obvious damage, frayed wires, or loose connections. Ensure the connector is fully seated.
How to Diagnose P0035
- 1Visually inspect the Bank 1 Sensor 3 oxygen sensor wiring and connector for damage, corrosion, or shorts.
- 2Using a multimeter, check the resistance of the oxygen sensor heater circuit. Compare to factory specifications.
- 3With the engine running, check for proper voltage and ground at the oxygen sensor connector using a multimeter.
- 4If wiring and sensor test good, use a scan tool to monitor the heater circuit operation and consider a PCM diagnosis.
P0035 on Popular Vehicles
Toyota Camry
2007-2024Oxygen sensor heater failures are common on higher mileage Camry models. Bank 1 Sensor 3 is typically located downstream of the catalytic converter.
85% fixed by replacing the O2 sensor
Honda Accord
2003-2024Similar to Toyota, Honda Accords often experience P0035 due to the oxygen sensor's internal heater failing. Access to the sensor can sometimes be tight depending on the engine configuration.
80% fixed by replacing the O2 sensor
Ford F-150
2004-2024On Ford F-150 trucks, while the O2 sensor itself is the primary cause, exposed wiring harnesses can sometimes be damaged by road debris or corrosion, leading to P0035.
75% fixed by replacing the O2 sensor, 15% by wiring repair
Frequently Asked Questions
What does P0035 mean?
P0035 indicates that the heater circuit for your Bank 1 Sensor 3 oxygen sensor is experiencing a high electrical current, meaning it's drawing more power than it should.
Can I drive with P0035?
Yes, you can drive safely with P0035. The vehicle will still operate, but your fuel economy will suffer, and your emissions will increase. Fix this within 1-2 weeks to avoid further issues.
Will P0035 clear itself?
No, P0035 will not clear itself. The underlying electrical fault in the heater circuit needs to be diagnosed and repaired. The Check Engine Light will remain on until the issue is resolved.
How do I fix P0035 myself?
Start by visually inspecting the oxygen sensor wiring and connector. If no damage is found, you'll need a multimeter to test the resistance of the sensor's heater element and check for proper voltage and ground at the connector. If the sensor tests bad, replacing the Bank 1 Sensor 3 oxygen sensor is the most common fix.
How much does it cost to fix P0035?
A DIY fix for P0035 typically costs $50-$300 for the oxygen sensor part. If you take it to a professional shop, expect to pay $200-$600, which includes parts and labor.
P0035 keeps coming back - why?
If P0035 keeps returning, it's likely due to an overlooked wiring issue, a faulty replacement oxygen sensor, or a rare problem with the Engine Control Module (ECM/PCM). Double-check all wiring connections and ensure the new sensor is functioning correctly.
Will P0035 fail emissions/smog test?
Yes, P0035 will cause your vehicle to fail an emissions or smog test. The Check Engine Light being on automatically results in a failure, and the faulty oxygen sensor heater means your emissions system is not operating efficiently.
What's the difference between P0035 and P0030?
P0030 is a general code indicating an issue with the HO2S heater control circuit for Bank 1 Sensor 1. P0035 is much more specific; it points to a high current condition in the heater circuit for Bank 1 Sensor 3, which is typically a downstream oxygen sensor after the catalytic converter.
P0035 on Toyota Camry?
On Toyota Camry models, especially those over 100,000 miles, P0035 is frequently caused by a failed Bank 1 Sensor 3 oxygen sensor heater element. The sensor is located after the catalytic converter on the exhaust system. Wiring issues are less common but still possible.
Questions to Ask Your Mechanic
Did you check the resistance of the Bank 1 Sensor 3 heater circuit?
Good answer: Yes, the resistance was out of specification, indicating an internal short in the sensor.
What did you find when you inspected the wiring harness for the Bank 1 Sensor 3 oxygen sensor?
Good answer: The wiring and connector were in good condition, with no signs of damage or corrosion.
Repair Cost Estimate
DIY Repair
Parts only
$50-$300
Shop Repair
Parts + labor
$200-$600
Save $150-$300 by doing it yourself
Difficulty
intermediate
Time
1-2 hours
Intermediate - requires a multimeter for testing and an oxygen sensor socket for removal/installation. Basic electrical diagnostic skills are helpful.
Cost of Waiting
Ignoring P0035 means your engine runs with an inefficient emissions system. This leads to reduced fuel economy and increased pollution. It will also cause your vehicle to fail any required emissions tests. While it won't cause immediate engine damage, it's a clear indicator of an electrical fault that needs attention.
While You're In There...
If you need to remove exhaust components for access, replacing old gaskets prevents exhaust leaks and ensures a proper seal.
Applying anti-seize to the threads of the new oxygen sensor prevents it from seizing in the exhaust pipe, making future removal much easier.
Tools You'll Need
- OBD-II Scan Tool
- Multimeter
- Oxygen Sensor Socket
- Ratchet and Extensions
- Wire Brush (for exhaust threads)
- Anti-seize Compound
P0035 is a common electrical code related to an oxygen sensor heater. The repair is straightforward for an intermediate DIYer, and once fixed, your vehicle's fuel economy and emissions performance will return to normal.
- Family-owned since 1957
- 990,000+ happy customers
- Fast nationwide shipping
- Easy returns
Your Next Steps
Step 1: Perform a thorough visual inspection of the Bank 1 Sensor 3 oxygen sensor and its wiring. Look for any signs of damage, corrosion, or loose connections.
Step 2: If the visual inspection doesn't reveal the issue, use a multimeter to test the resistance of the oxygen sensor's heater circuit. Compare your reading to the manufacturer's specifications. Also, check for proper voltage and ground at the sensor connector.
Step 3: If the sensor tests faulty, replace the Bank 1 Sensor 3 oxygen sensor. If the wiring is damaged, repair it. If both test good, further diagnosis of the ECM/PCM may be necessary, but this is rare.