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Details
| Specification | Value |
|---|---|
| Brand | AUTLOG |
| MPN | as4647 |
OE/OEM numbers (1)
Search by this OE number to find compatible parts
- MAZDA—ZJ0118921
Where this part fits
Original-fit position for OE ZJ0118921. The red ring marks where this part installs on the vehicle.
About this product
When knock sensor performance matters, the AUTLOG AS4647 delivers — built to the same dimensional and material standards as the original part it replaces. Compatible with MAZDA vehicles; use the vehicle selector above to confirm exact fitment for your make, model, and engine variant. Fitment data is sourced from TecDoc, the authoritative European parts catalogue. This part supersedes original equipment references: 0907019, 106806, 550340, 550340A and 11 more. Matching these numbers confirms a like-for-like replacement with no loss of function. AUTLOG is a recognised supplier of automotive replacement components to independent workshops and dealer networks across Europe. All parts are sourced from authorised distribution channels and carry full manufacturer traceability — you receive exactly the same component supplied to professional garages and dealer workshops. If fitment or specifications do not match your vehicle, our technical team can help identify the correct alternative — use the vehicle selector or contact us with your VIN for a guaranteed-fit recommendation. Replacing worn components on schedule preserves your vehicle's safety, reliability, and resale value — and aftermarket parts from established brands deliver OEM-equivalent performance at a fraction of the dealer price. Every part is dispatched from our UK warehouse with a 30-day money-back guarantee and free hassle-free returns.
Knock Sensor buying guide
Why replace this part?
The knock sensor detects engine detonation, allowing the ECU to retard ignition timing before piston or bearing damage occurs. A faulty knock sensor leaves the engine vulnerable to detonation damage or causes excessive timing retard that reduces power.
Signs you need a replacement
- Check engine light with P0325–P0334 codes
- loss of power and performance under load
- increased fuel consumption
- audible pinging or knocking when accelerating
- poor throttle response
When to replace
No fixed interval — replace on failure. Knock sensors can fail from heat cycles or mechanical vibration over high mileage.
Suitable cars
Equivalent products (15)
Knock Sensor AUTLOG AS4647 — compatible car models
| Car models | MAZDA: 2 (DE, DH), 3 (BK), 3 (BL), 3 Saloon (BK), 3 Saloon (BL) |
|---|---|
| Engines | 1.3 BiFuel; 1.3 (BK14); 1.6 MZR (BL14); 1.6 (BK12); 1.6 MZR (BL12) |
| Year of manufacture | 1999-2015 |
| Manufacturer article number (MPN) | AS4647 |
| OE part numbers | ZJ0118921 |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
AUTLOG as4647 . AS4647
- 1x Knock Sensor
Shipping, returns, warranty
Free UK delivery on orders over £99.00. Express and standard shipping available.
- Standard delivery: 2-5 business days
- Express delivery: 1-2 business days
- Free returns within 14 days
- All parts backed by manufacturer warranty
Warranty: 12-month manufacturer warranty on all parts. 14-day money-back guarantee if the part doesn't fit your vehicle.
Frequently Asked Questions
Is this Knock Sensor compatible with my car?
This Knock Sensor fits MAZDA vehicles. Use the vehicle selector at the top of the page to check exact compatibility — enter your car's make, model, and engine for a confirmed fitment match. All fitment data is verified through TecDoc.
What specifications does this AUTLOG Knock Sensor have?
The package includes the Knock Sensor as described in the specifications above. Check the "What's included" section for a full list of components. If mounting hardware or accessories are required, they will be listed separately.
What OE part numbers does this Knock Sensor replace?
This Knock Sensor replaces OE part numbers: ZJ0118921. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a Knock Sensor cost?
This AUTLOG Knock Sensor is available for £24.99. Knock Sensor prices vary depending on brand, specifications, and vehicle compatibility. AUTLOG parts offer a balance of quality and value, backed by our 14-day money-back guarantee.
How do I know when to replace my Knock Sensor?
The knock sensor protects the engine from detonation — a fault causes the ECU to retard ignition timing as a precaution, leading to reduced power and fuel economy. The check engine light with knock sensor codes is the primary indicator.
What tools do I need to replace a Knock Sensor?
Tools required vary by vehicle make and model. Generally, a basic socket set, screwdrivers, and vehicle-specific tools may be needed. We recommend consulting a workshop manual for your specific vehicle, or having the Knock Sensor fitted by a professional mechanic.
Can I use this part as a replacement for OE ZJ0118921?
Yes, this AUTLOG Knock Sensor is a direct replacement for OE part number ZJ0118921. It is manufactured to meet or exceed original equipment specifications, ensuring proper fitment and performance. All cross-reference data is verified through TecDoc.
Related categories
Common OE numbers for this part
Common original equipment numbers linked to stocked alternatives.
