VDO Knock Sensors
If a knock sensor fails, the ECU will likely trigger a Check Engine Light and may default to a ‘limp home’ mode where it retards ignition timing, leading to decreased acceleration and poor fuel economy. VDO Knock Sensors are engineered to provide a fast, reliable solution when a new knock sensor is needed. Manufactured in ISO-certified facilities to ensure quality, consistency, and long service life, they’re designed to meet OE specs for fit, form, function, and signal output.
Broad application coverage
VDO Knock Sensors for automotive service are available for domestic, Asian, and European cars, SUVs, and light trucks.
Year/make/model application data is available in our online catalog.
Why does the OE sensor go bad?
Knock sensors typically fail due to extreme engine heat, wiring degradation, and exposure to dirt, oil, or coolant leaks. Because they are bolted directly to the engine block, they are also prone to physical damage from over-torquing or to internal failure of their piezoelectric element due to constant vibrations.
The most common causes for knock sensor failure include:
Excessive heat and thermal cycling
Constant exposure to extreme temperatures can damage internal circuits and make the wiring harness brittle.
Contamination:
Leaking fluids such as motor oil, coolant, or road salt can seep into the sensor housing or corrode the electrical connector, interrupting the signal to the ECU.
Wear and fatigue
Knock sensors use a piezoelectric crystal that converts engine vibrations into a voltage signal. Constant vibration can eventually cause this crystal to degrade or crack.
Wiring damage
Damaged or severed wires or poor electrical connections can trigger a "circuit malfunction" code, even if the sensor itself is fine.
Improper installation or mechanical damage
Accidentally dropping the sensor before installation or over-tightening the mounting bolt can crack the internal components.
Ensure satisfied customers - choose VDO
VDO Knock Sensors help you make sure the job gets done right the first time. Go with the brand you can trust – VDO.