10000rpm Crankshaft Angle Sensor Hyundai Elantra 4262139052 30Hz–870Hz

Crankshaft Position Sensor 4262139052/909063 For Hyundai / Kia

Part number 4262139052 is widely compatible with a broad range of vehicles, primarily across the Hyundai and Kia model lines. The sensor is designed to work with various engine configurations, including both 4-cylinder and V6 powerplants.

This sensor is specifically designed for use with the following automatic transmission types:

• A4CF1 / A4CF2 (2004 and up)

• Various Hyundai-Kia automatic transmissions requiring output speed sensing

Note: Compatibility may vary by specific vehicle configuration, production date, and regional specifications. Always verify fitment for your particular vehicle before purchase.

A failing or malfunctioning crankshaft position sensor can produce a range of noticeable symptoms. Early recognition of these warning signs can prevent more serious engine damage and costly repairs.

The most common symptom of a failing crankshaft position sensor is difficulty starting the engine. The engine may crank for an extended period before starting, or may not start at all. This is particularly noticeable when the engine is hot—a condition often referred to as "hot start" failure. Since the ECU relies on the crankshaft position signal to determine when to fire the ignition and inject fuel, a weak or absent signal prevents the engine from starting.

A failing sensor may cause the engine to stall unexpectedly while driving. The stalling can occur suddenly and without warning, often with the tachometer dropping to zero during the event. In some cases, the engine may restart immediately after stalling, while in others it may require a cooling-off period before it will restart.

A malfunctioning crankshaft position sensor will typically trigger the Check Engine Light. Common diagnostic trouble codes associated with this sensor include:

• P0335 – Crankshaft Position Sensor "A" Circuit Malfunction

• P0336 – Crankshaft Position Sensor "A" Circuit Range/Performance

• P0337 – Crankshaft Position Sensor "A" Circuit Low Input

• P0338 – Crankshaft Position Sensor "A" Circuit High Input

• P0339 – Crankshaft Position Sensor "A" Circuit Intermittent

When the crankshaft position sensor provides an erratic or incorrect signal, the engine may exhibit:

• Rough or uneven idle

• Engine misfires

• Poor acceleration

• Reduced fuel efficiency

• Excessive engine vibration when operating

The tachometer may exhibit unusual behavior, such as fluctuating readings or dropping to zero while the engine is still running. This occurs because the tachometer receives its signal from the crankshaft position sensor.

Since the sensor also provides crucial data for transmission control, a failing sensor may cause:

• Erratic or delayed shifting

• Harsh or jarring gear changes (sometimes described as "whiplash" feeling)

• Speedometer malfunction

In some cases, the ECU may detect a critical sensor failure and place the vehicle into "limp mode" to protect the engine and transmission from damage. This significantly reduces engine power and limits vehicle speed.

When purchasing a replacement crankshaft position sensor (Part No. 4262139052), consider the following factors to ensure you select the right product for your needs:

Always confirm that the part number on the replacement sensor matches your vehicle's requirements. Part number 4262139052 has several supersession numbers, including 4262139050, 4262139051, 4262139100, 4262139200, and 4262139210. While these may be interchangeable in some applications, verify compatibility with your specific vehicle model and year.

This sensor is vehicle-specific and must be compatible with your engine and electronic control system. Cross-reference the sensor with your vehicle's:

• Make and model

• Model year

• Engine size and configuration (L4, V6, etc.)

• Transmission type

• Production date (particularly for vehicles built around 2006–2007)

Ensure the replacement sensor includes all necessary mounting hardware and sealing components. If the sensor is mounted on the engine, it typically requires an O-ring seal. Confirm that all necessary components are included in the package to avoid installation delays.

Crankshaft position sensors are exposed to significant engine heat. Look for a sensor with high heat resistance—preferably rated to at least 300°F (approximately 150°C). The operating temperature range should be suitable for your vehicle's operating environment.

Choose a sensor that meets or exceeds OEM specifications for:

• Signal accuracy – Proper pulse width and amplitude

• Durability – Resistance to heat, vibration, and contamination

• Precision engineering – Exact fit and function matching original specifications

Sensors that undergo rigorous testing—including extreme temperature cycling from -40°F to 257°F—offer greater reliability.

Some users have reported that sensors with the same part number may be electronically incompatible with certain model years. If you experience shifting issues or other problems after installation, the issue may be related to electronic compatibility rather than a defective part.

The crankshaft position sensor is typically located on the engine block, near the crankshaft pulley or flywheel. On some applications, it may be positioned on the back of the engine block near where the engine meets the transmission. Access may require working from underneath the vehicle. Consider whether you have the tools and expertise for DIY installation or if professional installation is recommended.

Verify the warranty terms offered with the sensor. Most OEM-grade sensors come with a minimum 12-month warranty. A longer warranty period often indicates greater confidence in product quality.

When ordering online, confirm shipping terms and delivery timelines. Standard delivery typically ranges from 4–10 days, with expedited options available. Ensure the seller uses reputable shipping carriers to protect the sensor during transit.