P0137
Fix within 1-2 weeksYour engine computer detects that the downstream oxygen sensor (Bank 1 Sensor 2) is reporting consistently low voltage, indicating a problem with its circuit or the sensor itself.
Code P0137 means your downstream oxygen sensor (Bank 1 Sensor 2) is reporting low voltage. Common causes: Faulty O2 sensor (70%), wiring issues (15%), exhaust leaks (10%). Drivability: Yes, for short trips. Repair cost: $50-$150 DIY, $150-$450 professional.
Can I Drive With P0137?
Yes, for short trips only
Essential trips under 10 miles, avoid highways if possible. Plan to fix within 1-2 weeks.
Stop driving immediately if: Flashing CEL, loud noises from the exhaust, burning smell, or significant power loss.
Symptoms of P0137
- 1Check Engine Light is on
- 2Reduced fuel economy
- 3Engine may run slightly rough or hesitate (less common)
- 4Increased exhaust emissions
Common Causes of P0137
Parts most likely causing this code, ranked by probability
The oxygen sensor itself has failed internally and is no longer sending the correct voltage signal to the engine computer.
70% of P0137 cases are fixed by replacing this part
Damaged, corroded, or loose wiring and connectors between the O2 sensor and the engine computer can interrupt the signal, causing a low voltage reading.
15% of P0137 cases are fixed by repairing wiring or connectors
An exhaust leak near or before the downstream O2 sensor can draw in outside air, diluting the exhaust gases and causing the sensor to read a falsely low oxygen content.
10% of P0137 cases are fixed by repairing an exhaust leak
A severely failing catalytic converter can sometimes affect the downstream O2 sensor's readings, though P0420 (catalyst efficiency) is more common in these cases.
5% of P0137 cases are fixed by replacing the catalytic converter
Check These First (Before Buying Parts)
- Visually inspect the Bank 1 Sensor 2 O2 sensor and its wiring for any physical damage, fraying, or corrosion.
- Listen for any exhaust leaks near the downstream O2 sensor. A small leak can cause this code.
How to Diagnose P0137
- 1Visually inspect the Bank 1 Sensor 2 O2 sensor and its wiring for any obvious damage, fraying, or corrosion.
- 2Check for exhaust leaks near the downstream O2 sensor by listening for hissing or feeling for escaping gases.
- 3Use an OBD-II scan tool to monitor the live data for Bank 1 Sensor 2 voltage. It should fluctuate, not stay consistently low.
- 4Inspect the O2 sensor connector for bent pins or corrosion.
- 5If possible, use a multimeter to test the O2 sensor's heater circuit and signal wire for proper voltage and resistance.
P0137 on Popular Vehicles
Honda CR-V
2002-2011P0137 is very common on these models and is almost always resolved by replacing the Bank 1 Sensor 2 oxygen sensor. Check for exhaust leaks first, but sensor failure is the primary cause.
80% fixed by replacing the O2 sensor
Toyota Camry
2002-2017For Toyota Camry, P0137 often indicates a failing downstream O2 sensor. It's less common for wiring issues or exhaust leaks to be the primary cause, but always inspect them.
75% fixed by replacing the O2 sensor
Ford F-150
22004-2014P0137 on Ford F-150s can be due to the O2 sensor itself, but also pay close attention to exhaust leaks, especially around the manifold or catalytic converter, which are common on these trucks.
65% fixed by replacing the O2 sensor, 15% by fixing exhaust leak
Frequently Asked Questions
What does P0137 mean?
P0137 indicates that the oxygen sensor located after the catalytic converter on Bank 1 (Bank 1 Sensor 2) is sending a voltage signal to the engine computer that is too low, suggesting a problem with the sensor or its circuit.
Can I drive with P0137?
Yes, you can drive with P0137 for short trips, but you should fix it within 1-2 weeks. Your fuel economy will suffer, and your vehicle will produce more emissions. Ignoring it can lead to more expensive repairs down the line.
Will P0137 clear itself?
No, P0137 will not clear itself. The engine computer will continue to detect the low voltage condition from the O2 sensor. You need to diagnose and fix the underlying issue, then clear the code with a scan tool.
How do I fix P0137 myself?
Start by visually inspecting the O2 sensor and its wiring for damage or corrosion. Check for exhaust leaks. If those are clear, replacing the Bank 1 Sensor 2 oxygen sensor is the most common fix. You'll need an O2 sensor socket and basic hand tools.
How much does it cost to fix P0137?
DIY repair costs for P0137 are typically $50-$150 for a new oxygen sensor. Professional repair at a shop will cost $150-$450, including parts and labor.
P0137 keeps coming back - why?
If P0137 keeps returning after replacing the O2 sensor, the problem is likely elsewhere. Common reasons include unresolved wiring damage, an overlooked exhaust leak, or a failing catalytic converter that is affecting the sensor's readings.
Will P0137 fail emissions/smog test?
Yes, P0137 will cause your vehicle to fail an emissions or smog test. The Check Engine Light being on automatically fails the test, and the underlying issue means your vehicle is likely producing higher emissions.
What's the difference between P0137 and P0136?
Both P0137 and P0136 refer to the Bank 1 Sensor 2 oxygen sensor. P0136 is a general 'circuit malfunction' code, meaning the computer detects an issue with the sensor's electrical circuit. P0137 is more specific, indicating the circuit's voltage is consistently 'low'.
P0137 on Honda CR-V?
P0137 is a common code on Honda CR-Vs, especially models from 2002-2011. It almost always points to a faulty downstream oxygen sensor (Bank 1 Sensor 2). Replacing the sensor resolves the issue in most cases.
Questions to Ask Your Mechanic
Did you check the live data for the Bank 1 Sensor 2 O2 sensor voltage, and what were the readings?
Good answer: The sensor voltage was stuck at 0.1V, confirming a low voltage condition. We also checked the heater circuit and it was functioning correctly.
Did you inspect the wiring and connector for the downstream O2 sensor for any damage or corrosion?
Good answer: Yes, we thoroughly checked the wiring harness from the sensor to the PCM for any breaks, shorts, or corrosion, and everything looked good.
Repair Cost Estimate
DIY Repair
Parts only
$50-$150
Shop Repair
Parts + labor
$150-$450
Save $100-$300 by doing it yourself
Difficulty
intermediate
Time
1-2 hours
Intermediate - requires an OBD-II scan tool to confirm diagnosis and an O2 sensor socket for removal/installation, which are not standard tools for every beginner.
Cost of Waiting
Ignoring P0137 will lead to decreased fuel economy and increased emissions. While it won't immediately damage your engine, prolonged driving with an incorrect O2 sensor reading can cause your engine to run rich or lean, potentially shortening the life of your catalytic converter. A $50-$150 O2 sensor replacement now prevents a $800-$2,500 catalytic converter replacement later.
While You're In There...
If you find an exhaust leak, replacing the relevant exhaust gasket (e.g., manifold or flange gasket) is necessary to seal the system properly.
Applying anti-seize to the threads of the new O2 sensor prevents it from seizing in the exhaust pipe, making future replacements much easier.
Tools You'll Need
- OBD-II Scan Tool
- O2 Sensor Socket (7/8 inch or 22mm)
- Ratchet and extensions
- Wire brush (for cleaning threads)
- Multimeter (optional, for advanced diagnostics)
- Jack and jack stands (for access)
P0137 is a very common emissions code. Most repairs are straightforward, involving replacing a single sensor, and your vehicle's fuel economy and emissions will improve significantly afterward.
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Your Next Steps
Step 1: Visually inspect the O2 sensor and its wiring for any damage or corrosion. Check for exhaust leaks near the sensor.
Step 2: If no obvious issues are found, use an OBD-II scan tool to monitor the live data for Bank 1 Sensor 2 voltage. If it's consistently low (e.g., below 0.2V), the sensor is likely faulty.
Step 3: Parts you'll likely need: A new Bank 1 Sensor 2 oxygen sensor, an O2 sensor socket, and possibly exhaust gaskets if a leak is found.