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

3,484

Rating Summary
3,176
153
40
23
92
3,176
153
40
23
92

Richard

10 years of experience
415 reviews
Richard
10 years of experience
This is the second time I’ve had Richard work on my car. He always does an outstanding job and is quick, knowledgeable and professional. Highly recommended!!
2012 DODGE CHALLENGER - CHECK ENGINE LIGHT IS ON - LAS VEGAS, NEVADA

Michael

13 years of experience
372 reviews
Michael
13 years of experience
Mike was an absolute professional when he arrived. He walked me thru the whole process of my repairs and also made good recommendations for preventive issues. His mechanical knowledge and good customer services was a breath of air and greatly appreciated :-)
2007 CHEVROLET AVALANCHE - CHECK ENGINE LIGHT IS ON INSPECTION - MARIETTA, GEORGIA

Rodrigo

10 years of experience
85 reviews
Rodrigo
10 years of experience
Rodrigo was exactly on time, very professional and friendly. He assessed my car, let me know the exact problem when a previous mechanic from a shop in my area was unable to. I felt he was very honest and sincere letting me know the level of urgency that I deal with the issue. Absolutely no pressure. I will absolutely use Rodrigo the next time I need anything to do with my car and will tell everyone about him. This is such a great service, I will never go to another mechanic again. It is so convenient. I couldn’t be happier. :)
2013 SMART FORTWO - CHECK ENGINE LIGHT IS ON - LAS VEGAS, NEVADA

Ricardo

8 years of experience
223 reviews
Ricardo
8 years of experience
Great service and was very helpful on what maintenance my vehicle needed and what to expect in the future. Would definitely recommend to anyone and will.
2004 MITSUBISHI LANCER - CHECK ENGINE LIGHT IS ON - LOS ANGELES, CALIFORNIA

More related articles

Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2422 OBD-II Trouble Code: Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed
Diagnostic Trouble Code (DTC): P2422 P2422 code definition Evaporative Emissions Control System (EVAP)...

Related questions

Q: The car has reduced engine power

Hello there. There are many potential causes for reduced power output. The most likely would be the fuel pump, low fuel pressure, battery, alternator, or fuel filter. A bad throttle sensor can cause this issue but the throttle body itself...

Q: P0016

Hi...Diagnostic Trouble Code P0016 has many causes other than a failed camshaft position sensor. Other possible causes for Code P0016(https://www.yourmechanic.com/article/p0016-obd-ii-trouble-code-camshaft-position-a-camshaft-position-correlation-bank-1-by-jay-safford) to set include: the camshaft timing is wrong because the timing chain jumped teeth; the camshaft phaser is out of...

Q: Loss of power when accelerating - 2012 Chevrolet Aveo LT

Hello. Be sure to never open the cooling system while the engine is hot. The difference in pressure between the inside of the system and atmospheric pressure will always cause the hot coolant to boil out and may cause harm....

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