Parts for your 2000 Toyota Crown-Knock sensor

2000 Toyota Crown knock sensor — yes, it’s fitted and it matters

Based on technical sources, the 2000 Toyota Crown does use a knock sensor (and on some engines, two). Toyota’s Crown S170 Electrical Wiring Diagram (1999–2003) shows “KNK” sensor circuits to the engine ECU, and the Toyota Repair Manual engine sections for 1G‑FE, 1JZ‑FSE and 2JZ‑FSE detail knock sensor inspection and diagnostics. Toyota’s Electronic Parts Catalogue for S170 Crown variants also lists the knock sensor as a serviceable part across those engines. So it’s absolutely relevant on a 2000 Crown.

For owners and workshops, the knock sensor is the unsung guardian of the Crown’s straight‑six. It “listens” for detonation (pinging) and tells the ECU to trim ignition timing before things get spicy under the bonnet. That means smoother running, better fuel economy and, most importantly, protection for pistons and bearings on 91–98 RON fuel. On JZ engines there are typically two sensors along the block, the 1G‑FE usually runs a single unit.

There’s no routine replacement interval, but the sensor and its sub‑loom deserve a look during servicing, particularly on vehicles with age, heat and vibration. Common flags include a Check Engine Light with codes like P0325/P0330, lazy performance, excessive timing retard, or pinging under load. If those show up, verify basics first: good fuel, no intake leaks, healthy cooling system. Then inspect the knock sensor harness for brittle insulation, oil contamination and loose connectors. A piezo knock sensor can’t be reliably tested with a simple resistance check, follow the Toyota diagnostic flow in the repair manual, or use a scope/scan tool to confirm operation.

Replacement is straightforward but accuracy matters. Use a quality OEM‑equivalent sensor, clean the block mating surface, and tighten to the specified torque from the service manual—over‑ or under‑tightening can kill the signal. Route the loom away from exhaust heat and sharp edges, and clip it properly so it doesn’t rattle. After fitting, clear fault codes and road‑test, watching knock correction and learnt timing on a scan tool.

Handy tips to keep the knock system happy:

• Run quality fuel (95/98 RON is ideal if it pings on 91), and keep the cooling system in top nick.
• Avoid pressure‑washing the sensor area, moisture in the connector causes dramas.
• If the sub‑loom is crusty, replace it along with the sensor—cheap insurance on an S170.

Popular questions about the 2000 Toyota Crown knock sensor

Does the 2000 Crown have one or two knock sensors?
Most 1JZ‑FSE and 2JZ‑FSE Crowns use two sensors spaced along the block, while the 1G‑FE commonly uses a single sensor. The exact count depends on engine code, the Toyota EWD and EPC for the S170 series confirm the configuration for each variant.

What fault codes point to a bad knock sensor on a 2000 Crown?
Typical OBD‑II codes are P0325 (Knock Sensor 1 Circuit) and P0330 (Knock Sensor 2 Circuit). These don’t always mean the sensor itself is dead—wiring damage, poor grounding, or an incorrectly torqued sensor can trigger the same codes. Always inspect the harness and follow the Toyota repair manual tests before replacing parts.

Can a bad knock sensor make the Crown feel gutless?
Yes. When the ECU loses a clean knock signal, it often runs conservative timing to protect the engine. That safety net can make the car feel flat, especially up hills or under load. Fixing the sensor or the loom, then clearing codes and confirming normal knock correction, usually brings the pep back.