Nissan 240SX Oxygen Sensor Replacement at your home or office.

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Oxygen Sensor Replacement Service

How much does a Oxygen Sensor Replacement cost?

On average, the cost for a Nissan 240SX Oxygen Sensor Replacement is $144 with $49 for parts and $95 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
1998 Nissan 240SXL4-2.4LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$281.35Shop/Dealer Price$332.94 - $465.21
1994 Nissan 240SXL4-2.4LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$193.95Shop/Dealer Price$228.71 - $310.44
1997 Nissan 240SXL4-2.4LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$312.55Shop/Dealer Price$376.96 - $547.64
1991 Nissan 240SXL4-2.4LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$193.95Shop/Dealer Price$228.69 - $310.40
1990 Nissan 240SXL4-2.4LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$504.11Shop/Dealer Price$616.42 - $930.79
1990 Nissan 240SXL4-2.4LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$193.95Shop/Dealer Price$228.71 - $310.44
1992 Nissan 240SXL4-2.4LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$509.11Shop/Dealer Price$621.27 - $935.52
1998 Nissan 240SXL4-2.4LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$317.55Shop/Dealer Price$382.19 - $553.06
Show example Nissan 240SX Oxygen Sensor Replacement prices

What is the Oxygen Sensor all about?

With each new model year, manufacturers are adding more oxygen sensors to better manage engine operation. Some high performance engines have an oxygen sensor for each cylinder as well as one for the rear of each catalytic convertor. The sensors are located either underneath the hood or underneath the car. The oxygen sensors are connected (screwed) to the exhaust pipe, either in front or back of the catalytic converter. The front (upstream) sensors measure the amount of oxygen in the exhaust system. The purpose of the front oxygen sensor(s) is to measure how rich or lean the gases are as the gases exit the combustion chamber. Depending upon whether the exhaust gas is lean (high in oxygen content) or rich (low in oxygen content), the amount of fuel entering the engine is adjusted by the engine management computer to try and maintain an ideal mixture that produces the lowest emissions output from the catalytic convertor.

Rear (downstream) sensors are located behind the catalytic converter. The purpose of the rear oxygen sensor(s) is to monitor the oxygen content of the exhaust gases leaving the catalytic convertor.

If one or more of the oxygen sensors are faulty, your car may not pass the emissions test. If you drive your car with a faulty oxygen sensor, you may get poor gas mileage and it can damage the catalytic converter.

Oxygen Sensor-MATROX-1

When replacing the oxygen sensor remember:

  • Many oxygen sensors are damaged by leaking oil or coolant. If that is the case, the cause of that leak needs to be identified and repaired, or else the replacement oxygen sensor will be damaged as well.
  • New vehicles require specific oxygen sensors, and not the universal sensors that were common prior to 1996.

How it's done:

  • Scan the computer in the car for codes.
  • Inspect for vacuum leaks and holes in the exhaust system.
  • Remove and replace the oxygen sensor if it is bad.
  • Check electrical connections.
  • Check for proper operation of oxygen sensors.
  • Clear diagnostic codes.
  • Test drive car.

Our recommendation:

Keep up with the tune-ups. If check engine light is on, don't drive the car too long without getting it inspected. If check engine light is flashing, pull over and get the car towed to avoid costly repairs. Ask the mechanic to inspect the vacuum hoses and leaks in the exhaust system. If the vacuum hose or exhaust system is leaking, it will display an oxygen sensor fault code. Replacing an oxygen sensor may not fix the problem.

What common symptoms indicate you may need to replace the Oxygen Sensor?

  • Check Engine light is on.
  • Car is getting poor gas mileage.
  • Emission test fails.

How important is replacing the oxygen sensor?

Your vehicle has multiple oxygen sensors, and they all help the car run optimally. The front sensors measure how much oxygen is in the exhaust stream to measure how rich or lean the gases leaving the gas chamber are. The rear sensors measure the oxygen content of the gases as they leave the catalytic converter. The oxygen sensors then relay this information to your vehicle’s electronic control unit, so that it can adjust as necessary. Because cars depend on an ideal fuel-to-air ratio to function optimally, the oxygen sensors are leaned on for engine performance. When your oxygen sensors fail your car will run less smoothly, get worse mileage, and have worse emissions.

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Meet some of our expert Nissan mechanics

Real customer reviews from Nissan owners like you.

Excellent Rating

(43)

Rating Summary
35
5
2
1
0
35
5
2
1
0

Deane

11 years of experience
340 reviews
Deane
11 years of experience
Nissan 240SX L4-2.4L - Car starts and then dies - San Diego, California
The initial appointment with Deane was fine, however, the follow-up was less than satisfactory. After his inspection Deane informed me I would be contacted by the office with a quote. After waiting more than 5 hours, I called and left a message requesting a call back. I was called back, given a quote and when requesting an appointment was told I'd be called again after checking Deane's schedule. Two hours later I was informed via message that Peter was assigned the repair appointment for 4/23.. One hour before the appointment, Peter called to reschedule due to a problem with needed parts. An hour later the office called stating there is no problem and Peter could arrive around noon. I'd had enough by then that I canceled the appointment. Deane as an individual was professional, but I would not recommend him because of the lack of professionalism demonstrated by his employer.

Matthew

11 years of experience
136 reviews
Matthew
11 years of experience
Nissan 240SX L4-2.4L - Pre-purchase Car Inspection - Las Vegas, Nevada
Very professional he called to let me know exactly what he found on the car he inspected and answered any questions I had

Jan

18 years of experience
16 reviews
Jan
18 years of experience
Nissan 240SX L4-2.4L - Drive Belt Tensioner Replacement - Temple City, California
Very great guy who listened to all my questions and concerns. He arrived 40 minutes early!! Jan was extremely helpful and patient. His work was also very fast but done very well and caution. Highly recommended to anyone and everyone within his area.

James

30 years of experience
873 reviews
James
30 years of experience
Nissan 240SX L4-2.4L - Engine is misfiring - Casselberry, Florida
James arrived a little earlier than our scheduled appointment, so we had some time to chat and go into detail about the car's history and so he could provide a more thorough diagnosis of my car. James was very polite, friendly, and a great conversationalist during the appointment. Related to the actual appointment, James was very thorough in his diagnosis of my car and even helped me understand a bit more about my car and what it needed so I could take that information and learn from it. During his report, he determined what was wrong with my car (a bad injector) and even went beyond to determine things that could come up as potential issues and how to remedy them. Overall, the experience was very positive and I'm glad that I went ahead and setup an appointment for James to diagnose my car. If I had someone that needed a mechanic or someone to diagnose their car, James would likely be the first person that came to mind.

Excellent Rating

(43)

Rating Summary
35
5
2
1
0
35
5
2
1
0
Number of Nissan 240SX services completed
473+
services done by our mechanics
TOTAL NUMBER OF EXPERT Nissan MECHANICS
1500+
experts on our platform

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