Keep your engine's spark timing on target with the Walker Products Ignition Knock (Detonation) Sensor 242-1021 (also 2421021), an OE-replacement sensor that monitors engine vibration frequencies to detect knock (detonation) and feeds that signal to the ECU so it can retard ignition timing in real time. It's a direct-fit replacement for a wide range of GM 3.1L and 3.4L V6 applications, including the 1996-2005 Buick Century (V6-3.1L), 1996-1998 Buick Skylark (V6-3.1L), 2000-2005 Chevrolet Impala (V6-3.4L), 1997-2003 Chevrolet Malibu (V6-3.1L), 1999-2004 Oldsmobile Alero (V6-3.4L) and 1996-2003 Pontiac Grand Prix (V6-3.1L) — see the Buyer's Guide tab for the full list of 28 applications.
The sensor uses a single male blade terminal with a female, circular connector. Mounting hardware and a wiring harness are not included. Country of origin: Taiwan.
This part cross-references / interchanges with the following part numbers:
What does the 242-1021 knock sensor do?
It monitors engine vibration to detect knock (detonation) and sends that signal to the ECU, which can then retard ignition timing to help protect the engine if spark knock occurs.
Which vehicles does this sensor fit?
It's a direct-fit replacement for many GM V6-3.1L and V6-3.4L applications across Buick, Chevrolet, Oldsmobile and Pontiac from 1996-2005. Check the Buyer's Guide tab for all 28 listed applications.
What are signs this knock sensor may need replacing?
A stored knock-sensor code such as P0325 or P0330, spark-timing or drivability issues, or a check engine light may indicate a failed sensor. Diagnose the cause before replacing, as codes can have other sources.
Does it include mounting hardware or a wiring harness?
No. Mounting Hardware Included: No and Wiring Harness Included: No. The sensor has a single male blade terminal with a female, circular connector.
Is this an OE-replacement part and where is it made?
Yes, Walker Products lists it as an OE-replacement sensor calibrated to match factory frequency response and output. Country of origin: Taiwan. Manufacturer part number 242-1021.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
