P0145 OBD-II Trouble Code: O2 Sensor Circuit Slow Response (Bank 1, Sensor 3)

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

SCHEDULE P0145 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0145 code

P0145 is a diagnostic trouble code (DTC) for "O2 Sensor Circuit Slow Response (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 P0145 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

P0145 code definition

O2 Sensor Circuit Slow Response (Bank 1 Sensor 3)

What the P0145 code means

P0145 is the OBD-II generic code indicating that the O2 sensor for bank 1 sensor 3 fails to have a voltage drop to below .2 volts for 7 seconds during a deceleration fuel cut off. The Engine Control Module (ECM) has determined the sensor response to be too slow.

What causes the P0145 code?

  • The ECM cuts all fuel to the engine during deceleration and the O2 sensors all should respond with a voltage output below .2 volts showing the exhaust stream is higher in oxygen content with no fuel.

  • The code is set if the O2 sensor for bank 1 sensor 3 does not respond to the fuel cutoff for around 7 seconds.

  • The O2 sensor may be defective or the fuel system injector is leaking.

What are the symptoms of the P0145 code?

  • The engine may stall or run rough on deceleration; fuel is getting in the engine when the ECM has cut the fuel.

  • The Check Engine Light will come on once the ECM sees a problem with the O2 sensor.

  • The engine may hesitate upon acceleration after a deceleration phase if the engine is loaded up with fuel.

How does a mechanic diagnose the P0145 code?

  • Scans codes and documents freeze frame data for the O2 sensor

  • Monitors the O2 sensor data to see if the voltage is dropping to below .2 volts during deceleration for all the O2 sensors

  • Checks the fuel injection system for leaking injectors if all the O2 sensors indicate voltages above .2 volts on deceleration

  • Checks the engine fuel pressure for a leaking fuel injector or fuel pressure regulator

  • Checks the O2 sensor for contamination with coolant or oil

  • Checks the O2 sensor harness for water contamination

  • Follows the manufacturer's specific pinpoint tests for further diagnosis

Common mistakes when diagnosing the P0145 code?

Follow these simple guidelines to prevent mistakes:

  • Check the complete fuel system for other problems before replacing any O2 sensor.

  • Check the fuel injection system for any leaking injectors, or a pressure regulator that is causing fuel fouled O2 sensors and catalyst.

  • Repair oil or coolant leaks onto the O2 sensor before replacing the sensor to prevent contaminating the new sensor.

How serious is the P0145 code?

  • The ECM cannot control the fuel shut off if the fuel injectors are leaking. This will lead to excessive fuel consumption.

  • Excessive fuel in the exhaust stream on deceleration can cause the engine to stall or run rough.

  • A failed sensor will not affect the ECM’s control of the air-fuel ratio for the engine.

What repairs can fix the P0145 code?

Additional comments for consideration regarding the P0145 code

The slow response of an O2 sensor may be due to a sensor that is just getting old and over time may get contaminated with time with carbon and other contaminants that deteriorate the sensors ability to respond to the exhaust changes.

Need help with a P0145 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.

P0145
Check Engine Light
trouble codes

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

SCHEDULE P0145 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

3,936

Rating Summary
3,597
169
44
25
101
3,597
169
44
25
101

Robert

17 years of experience
436 reviews
Robert
17 years of experience
Great work, very nice guy.
2014 MITSUBISHI LANCER - CHECK ENGINE LIGHT IS ON - DENVER, COLORADO

Todd

24 years of experience
28 reviews
Todd
24 years of experience
Very friendly and very knowledgeable and focused on task. Very helpful. I would use his help again.
2012 CHEVROLET MALIBU - CHECK ENGINE LIGHT IS ON - WILLIAMSBURG, VIRGINIA

Brikk

15 years of experience
299 reviews
Brikk
15 years of experience
I recently purchased a vehicle and the check engine light came on soon after. Brikk came on time, explained the process, and gave detailed information on what he was looking for and how to correct it. The experience felt like I was talking to a friend than a mechanic. I will book Brikk every time I have an issue.
2007 VOLKSWAGEN PASSAT - CHECK ENGINE LIGHT IS ON - MATTHEWS, NORTH CAROLINA

Jerimiah

16 years of experience
216 reviews
Jerimiah
16 years of experience
Very friendly, knowlegable, and on time
2001 FORD F-350 SUPER DUTY - CHECK ENGINE LIGHT IS ON INSPECTION - HENDERSON, NEVADA

More related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...

Related questions

Q: Throttle position sensor light on

For many vehicles, regardless of manufacturer, there is the need to do a "re-learn" sequence (after replacing the TPS or a battery) so the TPS and transmission will work smoothly. You may have to drive the vehicle for a bit...

Q: Car stalling at random, could be an electrical problem?

Generally, when the car is running consistently and on all cylinders, when stalling it is often times a fuel supply issue (or in some cases indirectly related to electrical - i.e. bad connection or pulse to the fuel injectors). I...

Q: Can catalytic converter particles damage the engine?

Not really if you think about it. You've got a a catalytic converter which is on the exhaust system. The hot gas comes out of the engine in the manifold and then goes through the exhaust system to the catalytic...

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