MR578117 MITSUBISHI Knock Sensor Lancer

Review MITSUBISHI Genuine Knock Sensor for LANCER

The Mitsubishi MR578117 Knock Sensor is an essential component of your vehicle's engine management system designed to detect and prevent engine knocking or detonation. This sensor continuously monitors the sound waves generated by the engine's combustion process and sends critical data to the engine control module (ECM).

The MR578117 Knock Sensor is a piezoelectric type, which means it converts mechanical energy into electrical energy through the use of crystals. The sensor has a robust and compact design, measuring approximately 1.3 inches (32mm) in length, 0.6 inches (16mm) in width, and 0.4 inches (10mm) in height. Its lightweight construction ensures minimal additional load on the engine.

Mounted on the engine block, the knock sensor utilizes a pickup element that is sensitive to vibrations. When engine knocking occurs, the sensor detects the distinct sound waves and sends a signal to the ECM. The ECM then adjusts the engine's fuel injection and ignition timing to eliminate the knocking, ensuring optimal engine performance and longevity.

This Mitsubishi MR578117 Knock Sensor is engineered to meet the highest industry standards for precision, reliability, and durability. It is designed to withstand the harsh operating conditions of an engine environment, including extreme temperatures and vibrations. The sensor's protective housing shields it from engine debris and other contaminants, ensuring a long service life.

Replacing a faulty knock sensor with the genuine Mitsubishi MR578117 Knock Sensor ensures the continued proper functioning of your engine management system. By maintaining optimal engine performance, you can enhance fuel efficiency, reduce emissions, and minimize the risk of costly engine damage. Installing this sensor is a straightforward process, typically involving unscrewing the old sensor and screwing in the new one. Always ensure you follow the vehicle manufacturer's instructions for installation.

Buying a Mitsubishi MR578117 knock sensor involves weighing its potential benefits against the possible drawbacks to determine if it is a worthwhile investment for your vehicle's engine system. Here are some pros and cons to consider:

1. Improved Engine Performance: A faulty knock sensor can cause engine performance issues, including misfires, rough idling, and poor fuel efficiency. Replacing the faulty sensor with a new one can help improve engine performance and prevent potential engine damage.

2. Preventing Engine Damage: A knock sensor monitors engine sounds and alerts the engine control unit (ECU) when it detects abnormal engine sounds, such as knocking or pinging. By replacing a faulty knock sensor, you can prevent potential engine damage caused by these abnormal sounds.

3. Cost-Effective: Replacing a knock sensor is generally a cost-effective repair compared to other engine repairs. The price of the sensor itself is relatively low, and the labor costs for installation are also reasonable.

1. Potential for False Positives: A knock sensor can sometimes produce false positives, which can result in unnecessary engine adjustments or even engine shutdowns. While rare, this can be inconvenient and may require additional diagnostic work to determine the source of the issue.

2. Labor Costs: While the cost of the sensor itself is relatively low, labor costs for installation can add to the overall cost of the repair. This can be a significant consideration for those who prefer to perform repairs themselves or who have limited budgets.

3. Potential for Additional Repairs: A faulty knock sensor can sometimes be a symptom of a larger engine issue. In such cases, replacing the sensor may only be a temporary solution, and additional repairs may be required to address the root cause of the problem.

Replacing a faulty Mitsubishi MR578117 knock sensor can help improve engine performance, prevent potential engine damage, and is generally a cost-effective repair. However, there is a small risk of false positives and the potential for additional repairs if the knock sensor is a symptom of a larger engine issue. Ultimately, the decision to replace the sensor depends on the individual's budget, technical expertise, and the specific circumstances of their vehicle. If you are unsure about the condition of your vehicle's knock sensor, it is recommended to consult a qualified mechanic for an accurate diagnosis and repair recommendation.

If you are experiencing symptoms of a faulty knock sensor, such as engine misfires, rough idling, or poor fuel efficiency, it is recommended to have the sensor inspected and replaced if necessary. This can help improve engine performance, prevent potential engine damage, and ensure the safe and reliable operation of your vehicle. If you are unsure about the condition of your vehicle's knock sensor, it is recommended to consult a qualified mechanic for an accurate diagnosis and repair recommendation.

Details:

Parts must be resalable and in the original packaging. Shipping carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer. Electrical parts are not returnable.

specifications ignitioncomp:

• for models: Lancer
• brand: Mitsubishi
• mpn: Mr578117
• part type: Sensor
• genuine oem: Yes
• manufacturer warranty: 1 Year
• universal fitment: Direct Replacement
• year: 2003 2004 2005 2006
• parts included: Only Part Reference 7 On The Diagram Is Included

payments ignitioncomp:

• credit card: discover
• other
• wallet: apple-pay

general ignitioncomp:

• category: Auto Parts > Car Truck Accessories > Ignition Systems Components

shipping ignitioncomp:

• transit: 5-11 days
• type: fixed
• service: ups ground, ups 2nd day air, ups next day air saver
• class: standard, expedited, one-day
• carrier: ups

returns ignitioncomp:

• time: 30 days
• paid by: seller
• policy: returns accepted

seller ignitioncomp:

• # reviews: 267
• rating: 98.1%
• city: new port richey, florida

offer ignitioncomp:

• in stock #: 5
• availability: in stock
• started: november 24, 2025
• prices: $70.00–$157.50
• item condition:
  • New
  • New other (see details)
  • Used
• sold #: 13
• options: ship-to-home