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

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


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 $154.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $50.0 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 $154.99 $50.0
Toyota $154.99 $50.0
BMW $164.99 $50.0

*Estimates may vary by market

SCHEDULE P0145 DIAGNOSTIC Get a fair and transparent estimate upfront

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.

Check Engine Light
P0145
trouble codes

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0145 code.

SCHEDULE P0145 DIAGNOSTIC
Get a $50 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(8600)

Rating Summary
8017
273
65
46
199
8017
273
65
46
199
 at YourMechanic

Brandon

9 years of experience
133 reviews
Brandon
9 years of experience
Ford Escort L4-2.0L - Check Engine Light is on - Nashville, Tennessee
Brandon showed up ahead of schedule, was very personable and diagnosed my problems. He also scheduled my next appointments which will be with him.
 at YourMechanic

William

23 years of experience
33 reviews
William
23 years of experience
Lexus IS250 V6-2.5L - Check Engine Light is on - Mableton, Georgia
Arrived early which was great. William was courteous, and attentive to the issue. Even though it took several attempts I'm so happy he was determined to fix it and he did!
 at YourMechanic

Dan

40 years of experience
1080 reviews
Dan
40 years of experience
Plymouth Grand Voyager - Check Engine Light is on - Lawrenceville, Georgia
Mr. Dan Barber was quite patient, courteous and quite knowledgeable. From my observation, Mr. Barber appears to be quite professional.
 at YourMechanic

Christopher

9 years of experience
120 reviews
Christopher
9 years of experience
Ford Fiesta L4-1.6L - Check Engine Light is on - Smyrna, Georgia
Chris communicated with us each step of the way up until his arrival. He listened well, was knowledgeable, and was prepared. He took the time to diagnose the problem, explained the what, why and how and provided a solution. I would definitely recommend him and will use him again.


More related articles

P2529 OBD-II Trouble Code: Vacuum Reservoir Press Sensor Circuit Intermmittent
P2529 code means the vacuum reservoir pressure sensor is not sending an input signal due to a defective vacuum sensor, pump, hose, valve, or a leak.
P0391 OBD-II Trouble Code: Camshaft Position Sensor "B" Circuit Range/Performance (Bank 2)
P0391 code means indicates that the problem is on the side of the engine which does not contain cylinder #1 due to bad sensors, or connectors.
P3483 OBD-II Trouble Code: Cylinder 11 Deactivation/Intake Valve Control Circuit Low
P3483 code means that the intake control solenoid for the #11 cylinder is open, shorted or pushing back with a lot of resistance due to a short.

Related questions

"Engine Power is Reduced" message after which car slows down
Your vehicle is equipped with a fail-safe system that is designed to decrease the engine power under certain conditions to prevent engine damage. Some of these conditions would include transmission malfunctions, engine overheating, or a lack of response from an...
Check Engine Light is on and I've noticed one minute my gas says a half a tank and the next it's at a quarter
Hello. This is most likely a faulty fuel sending unit (https://www.yourmechanic.com/services/fuel-gauge-sender-replacement). This is a unit that sits in the fuel tank that sends a signal relaying how much fuel is in the tank. These commonly go bad on many cars....
What can cause my oxygen sensor to get damaged during a oil change and fuel system cleaning?
Hi, thanks for writing in. The oil change would not damage an oxygen sensor. The fuel system cleaning could possibly cause this condition, but it depends on the cleaner type and mixture. I would recommend having an expert from YourMechanic...

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 (844) 997-3624 · hi@yourmechanic.com