P2270 OBD-II Trouble Code: O2 Sensor Signal Stuck Lean Bank 1 Sensor 2

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2270 code

P2270 is a diagnostic trouble code (DTC) for "O2 Sensor Signal Stuck Lean Bank 1 Sensor 2". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $114.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford $114.99 $20.0
Toyota $114.99 $20.0
BMW $124.99 $20.0
SCHEDULE P2270 DIAGNOSTIC Get a fair and transparent estimate upfront

P2270 trouble code definition

O2 Sensor Signal Stuck Lean Bank 1 Sensor 2

What the P2270 code means

P2270 is an OBD-II generic code for the O2 sensor signal stuck lean on bank 1 sensor 2 to the engine control module (ECM). This means that the O2 sensor in bank 1 sensor 2 indicates either too much oxygen in the exhaust stream, an open circuit, or a defective sensor which causes a lean signal to the ECM.

What causes the P2270 code?

  • The engine control module (ECM) got a lean voltage signal return from the bank 1 sensor 2 oxygen sensor.

  • The ECM attempts to correct the output by going rich while monitoring the signal, sets code, and turns on the Check Engine Light if the output stays lean.

  • The wiring or connection to the sensor is damaged causing the lean output.

What are the symptoms of the P2270 code?

  • The Check Engine Light will be illuminated and the code is set in ECM memory as a fault.

  • The engine fault may be the P2270 and also catalyst codes may be set.

How does a mechanic diagnose the P2270 code?

  • Scans and documents the code in the ECM

  • Diagnoses the code, as per the manufacturer's pinpoint test, to verify the O2 sensor signal

  • Disconnects and tests the O2 sensor for proper output voltage as specified

Common mistakes when diagnosing the P2270 code

  • Clearing ECM memory codes before checking the freeze frame data of the failure

  • Failing to clear ECM codes after the P2270 codes are fixed

  • Replacing the O2 sensor before any exhaust leaks are repaired.

How serious is the P2270 code?

Code P2270 is an indication that the O2 sensor does not detect the catalyst efficiency and can cause the vehicle to fail an emission test.

What repairs can fix the P2270 code?

Additional comments for consideration regarding the P2270 code

Code P2270 can be generated by a vehicle that has an exhaust leak between the first and second O2 sensors. The added O2 entering the exhaust will give erroneous signals from the sensor that is downstream from the leak.

Need help with a P2270 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

Check Engine Light
trouble codes
P2270

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P2270 code.

SCHEDULE P2270 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(7400)

Rating Summary
6879
249
58
41
173
6879
249
58
41
173
 at YourMechanic

David

13 years of experience
393 reviews
David
13 years of experience
Chevrolet Malibu L4-2.4L - Check Engine Light is on Inspection - Marietta, Georgia
He explained everything to me in detail on what I needed to know about my car. Definitely recommend him for getting the job done.
 at YourMechanic

Raymond

37 years of experience
402 reviews
Raymond
37 years of experience
Toyota Camry L4-2.2L - Check Engine Light is on - Las Vegas, Nevada
Raymond did a great job however I was charged for two hours labor and he was only here less than 45 minutes. should I expect this on future appointments with your mechanic ?
 at YourMechanic

Shane

17 years of experience
217 reviews
Shane
17 years of experience
Volkswagen EuroVan V6-2.8L - Check Engine Light is on Inspection - Austin, Texas
Arrived on time. Explained the issues he found and how he will fix it. I have parts on order and will schedule an appointment to have Shane install the parts when they arrive.
 at YourMechanic

Kanstantsin

19 years of experience
51 reviews
Kanstantsin
19 years of experience
Ford F-150 V8-4.6L - Check Engine Light is on Inspection - Littleton, Colorado
Kanstantsin arrived early. Was very courteous and professional. Will highly recommend to anyone. Thank you Kanstantsin.


Related questions

Diagnostic code read o2 sensor bad, replaced o2 sensor, cleared code but engine light came back on, is it caused by bad air filter
Hello there. Typically jump starting a vehicle doesn't trigger an OBD-II error code. However, one of the most common misdiagnosis issues with the P-2270 (https://www.yourmechanic.com/article/p2270-obd-ii-trouble-code-o2-sensor-signal-stuck-lean-bank-1-sensor-2-by-jay-safford) is replacing the O2 sensor before diagnosing if there are any exhaust leaks. Obviously, you'll...
2003 lincoln ls v6. P2270 code is read on scanner. I've changed the catalytic converter but the code is still coming back.
Hi there. The code of P2270 (https://www.yourmechanic.com/article/p2270-obd-ii-trouble-code-o2-sensor-signal-stuck-lean-bank-1-sensor-2-by-jay-safford) is coming up for an issue that is causing the emissions to be out of calibration. Check the following conditions on your engine. Check For an exhaust leak near O2 sensor For a...

More related articles

P0774 OBD-II Trouble Code: Shift Solenoid E Intermittent
P0774 means the PCM registered a problem in shift solenoid E, caused by low ATF level, failed shift solenoid, or blocked transmission passages.
P0653 OBD-II Trouble Code: Sensor Reference Voltage “B” Circuit High
P0653 means that control modules notes a fault in the signals from this sensor due to faulty ground wires, control modules, or other circuitry.
P004E OBD-II Trouble Code: Turbocharger/Supercharger Boost Control “A” Circuit Intermittent/Erratic
P004E means that there is an electrical malfunction with the turbocharger or supercharger boost control due to a leak, or a stuck westgate.

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com