P2274 OBD-II Trouble Code: O2 (Oxygen) Sensor Signal Stuck Lean Bank 1 Sensor 3

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P2274 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2274 code

P2274 is a diagnostic trouble code (DTC) for "O2 (Oxygen) Sensor Signal Stuck Lean Bank 1 Sensor 3". 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 $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 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$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P2274 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

P2274 code definition

O2 (Oxygen) Sensor Signal Stuck Lean Bank 1 Sensor 3

What the P2274 code means

This code definition indicates that either the oxygen sensor has failed, there is an exhaust leak before the sensor, or the engine has an intake manifold leak creating a lean combustion mixture.

What causes the P2274 code?

This code is caused by a failed oxygen sensor or the sensor is seeing an excessive amount of oxygen in the exhaust stream. As the name indicates, an oxygen sensor is measuring the amount of oxygen in the exhaust stream.

What are the symptoms of the P2274 code?

How does a mechanic diagnose the P2274 code?

After connecting a scanner to retrieve the code, the technician should study the engine data on the scanner. This code can be as simple as a bad O2 sensor or be the result of problems with the motor.

This is a downstream O2 sensor and is exclusively used to monitor the catalytic converter efficiency. Downstream O2 sensors are installed after the catalytic converter and upstream O2 sensors are installed before. Downstream O2 sensors should not oscillate like upstream O2’s. Their readings should be a relatively constant voltage.

If the vehicle runs good, has no other codes or signs of problems under the hood, the next thing to do is introduce propane into the intake or simply snap the throttle. Both of these actions will create a rich fuel mixture for a brief moment. Scan tool data for the affected O2 sensor should be monitored at the same time to observe the reaction, if any, from the O2 sensor. If the O2 sensor reacts quickly, it can be assumed the sensor is good and there is likely another problem contributing to this code. If the O2 does not react and the data does not show a voltage change, the O2 sensor should be changed.

Common mistakes when diagnosing the P2274 code

Usually when this code is set, the O2 sensor is bad. For this reason it is easy to fall on what is likely the problem and replace the O2 sensor without any other diagnosis. Most of the time this works, but sets us up for times when we have already quoted the cost to the customer but replacing the O2 sensor did not fix the problem.

With modern cars there are as many as six O2 sensors. Often times it can be difficult to determine which sensor this code points to. When this occurs, a mechanic may replace the wrong O2 sensor or find himself attempting to diagnose the wrong O2 sensor.

Finally, it is common for a mechanic to miss vacuum leaks or exhaust leaks that will affect the O2 sensor data. Vacuum leaks create lean conditions. Newer vehicles will have many systems that rely on the vacuum in the intake manifold. Not all these systems are under the hood. Often times vacuum hoses route under the dash or to the rear of the vehicle making it difficult to track down the source of a vacuum leak. Exhaust leaks actually draw in oxygen and taint the O2 sensors readings.

How serious is the P2274 code?

This code is usually a minor annoyance, depending on the source of the failure. If it isn’t corrected soon, it can cause some significant engine damage. A lean air fuel mixture can burn valves, cause overheating and damage cylinder walls and or pistons if left unrepaired.

What repairs can fix the P2274 code?

The most common repairs for an O2 sensor code are replacing the O2 sensor or repairing a vacuum leak in the intake manifold. Exhaust leaks are often a problem, but not as frequent as the O2 sensor itself and intake manifold leaks.

Some other possible component repairs are as follows:

Additional comments for consideration regarding the P2274 code

Oxygen sensors should be considered maintenance items just like spark plugs. On average, an O2 sensor will last as much as 150,000 miles. Under certain circumstances, their lifespan will be greatly shortened. When undertaking repairs and or diagnosis of O2 sensors, the mileage of the vehicle should be taken into consideration. A technician will be quicker to replace an O2 sensor on older vehicles. Even if it isn’t a problem, just like your spark plugs, they will definitely be nearing the end of their lifespan. So the replacing of a suspected O2 sensor on a vehicle with an excess of 150,000 miles is good regardless if it is actually failing at that moment; it would be preventative maintenance.

Need help with a P2274 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.

P2274
trouble codes
Check Engine Light
oxygen sensors

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P2274 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

4,004

Rating Summary
3,661
169
45
25
104
3,661
169
45
25
104
Patrick

Patrick

30 years of experience
865 reviews
Patrick
30 years of experience
good job, good guy - I'd certainly use him again
2002 HONDA ACCORD - CHECK ENGINE LIGHT IS ON - AUSTIN, TEXAS
Jerome

Jerome

31 years of experience
68 reviews
Jerome
31 years of experience
Jerome did an excellent job explaining what he was doing and why. I appreciated his going into detail about the expected outcome of a particular test and the possible causes of an unexpected outcome.
2013 CHEVROLET MALIBU - CHECK ENGINE LIGHT IS ON - UPPER MARLBORO, MARYLAND
Doug

Doug

31 years of experience
92 reviews
Doug
31 years of experience
I was real happy with Doug he checked the truck over and explained to me what is wrong and what I needed to have it repaired. he was on time and after we met he went right to work. I know when I need some answers or work on my truck I will call Doug.
1999 GMC SONOMA - CHECK ENGINE LIGHT IS ON INSPECTION - RIVERSIDE, CALIFORNIA
Peter

Peter

40 years of experience
1059 reviews
Peter
40 years of experience
Peter knew exactly what was going on with my car. He diagnosed the problem quickly. He was fast and efficient. He explained what he was doing so I could understand the process of the repairs that were being done. I would rate Peter an ALL-STAR 10.
2003 CHRYSLER PT CRUISER - CHECK ENGINE LIGHT IS ON - SCOTTSDALE, ARIZONA

More related articles

How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...
Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....

Related questions

Q: The car starts, but when I hit the gas the check engine light blinks & it feels like I don't get much power, sometimes smell gas.

Hello. A flashing Check Engine Light is an indicator that the computer has detected an issue with the vehicle's engine management system that could potentially cause harm to the emissions system. Continuing to drive with a flashing Check Engine...

Q: reduce engine speed , trac ,and service engine light on. Had gas pedal assembly and throttle replaced.. Wire harness or computer n

This vehicle may have a wire harness issue of bad crimps on the connectors to the cluster, engine control module (ECM), and other areas that can cause these intermittent failures. The codes you are receiving are most likely the...

Q: O2 sensor 2003 Chevrolet Malibu

Hi there - yes, it is possible that a malfunctioning or dead O2 sensor could cause stalling. It will, over time, clog your catalytic converter - an expensive repair - and spew increased toxic exhaust into the atmosphere. In most...

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.

1-800-701-6230 · hi@yourmechanic.com