Buy Mitsubishi Oxygen Sensor

A-Premium®Part # APOS0400

2pc Oxygen Sensor 4-Pin A-Premium APOS0400

4.5429 Reviews

$56.99

Edit ZIP code

3-year warranty

90 days free return

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Add Trim and Engine info to ensure a guaranteed fit

Vehicle: Mitsubishi

Quantity2

Installation PositionCheck the fitment chart

Item LocatedUnited States

Part interchange

250-24253, 25024253, 4727446AD

item #1000WHDS

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Symptoms of a Bad Oxygen Sensor

Check Engine Light is the most common sign with trouble codes like P0130-P0167, poor fuel economy means the engine burns more fuel than necessary leading to lower MPG, and rough idle with engine misfires from imbalanced air-fuel mixture, plus increased emissions causing failed smog tests. These symptoms start small but get worse fast.

A bad O2 sensor causes rough idle and loss of engine power, along with poor acceleration, engine misfires, and even stalling since bad oxygen sensors disrupt essential engine functions including timing, combustion intervals, and air-fuel ratio. Your fuel economy can drop 20-40% when sensors fail.

Watch For These Warning Signs:

? Check engine light: Codes P0130-P0167 mean sensor problems

? Terrible gas mileage: 20-40% worse fuel economy overnight

? Rough idle: Engine shakes, stalls, or surges at stop lights

? Failed emissions: Won't pass smog test, can't register your vehicle

? Rotten egg smell: Catalytic converter overheating from bad fuel mixture

How Much Does O2 Sensor Replacement Cost?

Professional oxygen sensor replacement typically costs between $150 and $600 depending on labor rates and your vehicle's make and model, and timely replacement not only restores performance but prevents further damage. Most of that cost is labor and dealer markups.

We sell direct to you at $24.99 to $59.99 per sensor?that's OEM quality at 50-75% off dealer prices. You save $100-$500 depending on how many sensors your car has. Most vehicles have 2-4 oxygen sensors total. Replacing them yourself takes 30 minutes with basic tools, or your mechanic can install ours for just the labor cost.

Sensor Position	What It Does	Our Price
Upstream (Pre-Cat)	Controls real-time fuel mixture	$24.99-$59.99
Downstream (Post-Cat)	Monitors catalytic converter	$24.99-$59.99

Sensor Position

What It Does

Our Price

Upstream (Pre-Cat)

Controls real-time fuel mixture

$24.99-$59.99

Downstream (Post-Cat)

Monitors catalytic converter

$24.99-$59.99

What Does the O2 Sensor Do in a Car?

Your oxygen sensors sit in your exhaust system measuring oxygen levels in the exhaust gases. They send voltage signals to your engine computer?0.1 volts when there's too much oxygen (lean), 0.9 volts when there's too little (rich). Your computer reads these signals and adjusts fuel injection to keep your engine running at peak efficiency.

Oxygen sensors are not components that need regular servicing or replacement like brake pads or motor oil, typically lasting anywhere between 30,000 to 100,000 miles and should be replaced as soon as they fail. When they do fail, replace them immediately to avoid catalytic converter damage.

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O2 sensors for 16,399+ vehicles | From $24.99

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Frequently Asked Questions

Can I drive with a bad O2 sensor?

While you can drive with a faulty oxygen sensor temporarily, doing so for extended periods can damage your catalytic converter and engine. The sensor failure causes rich fuel mixture that destroys your cat?a $1,000-$2,500 repair. Replace the sensor now before it costs you thousands.

How many O2 sensors does my car have?

Many standard vehicles come with at least two oxygen sensors. V6 and V8 engines typically have 4 sensors?one before and one after the catalytic converter on each bank. Check your service manual or contact us with your vehicle info and we'll tell you exactly how many you need.

Should I replace all O2 sensors at once?

If one sensor fails, the others are probably close behind since they all have similar wear. Replacing all sensors at once prevents you from paying labor twice. We offer great prices on sensor sets?buy multiple and save even more than replacing one at a time.

Will a new O2 sensor fix my check engine light?

A failing oxygen sensor is one of the most common reasons for a check engine light, and if the sensor sends wrong readings, the engine control unit will log an error and turn on the light. Replace the bad sensor, clear the codes with an OBD scanner, and the light should stay off.

Do your sensors work as well as OEM parts?

Our sensors use the same zirconia ceramic elements and platinum electrodes as factory parts. They're built to OEM specifications and carry a 3-year warranty?that's longer than most dealer warranties. You get identical performance and reliability at fraction of the price.

Oxygen Sensor

Oxygen Sensors Starting at $24.99