Parts for your 2013 Toyota Mark x-Knock sensor

2013 Toyota Mark X Knock Sensor

Yes, the 2013 Toyota Mark X uses knock sensors. Technical sources including the Toyota GRX130-series Repair Manual for the 4GR-FSE (2.5L) and 2GR-FSE (3.5L) engines specify “Sensor, Knock Control” units mounted on the engine block (one per bank on the V6). The Toyota Electronic Parts Catalogue (EPC) for GRX130/GRX133/GRX135 lists knock sensors and related harnesses for these engines, and Toyota’s diagnostic references note OBD-II codes such as P0325 (Knock Sensor Circuit, Bank 1) and P0330 (Bank 2), confirming their presence and role.

On the 2013 Toyota Mark X, the knock sensor’s job is to listen for detonation (pinging) inside the cylinders. When it detects that sharp vibration signature, it signals the engine control module (ECM) to slightly pull back ignition timing to protect the engine. That keeps things smooth under our Aussie and Kiwi fuels, whether it’s a hot summer arvo or a cold morning start. With the 4GR-FSE and 2GR-FSE V6s, there are typically two sensors tucked in the V of the engine, one per bank, so the ECM can fine-tune both sides.

Because knock sensors don’t have wear items, there’s no regular replacement interval. As part of routine servicing though, it’s smart to keep an eye on the related bits: good quality petrol, clean intake, healthy cooling system, and no oil leaks pooling in the valley of the V. During major services, a quick visual of the engine harness routing and connectors can save headaches later—heat and age can make plugs brittle, and a poor connection will throw the timing strategy out. If the check engine light pops with P0325 or P0330, or there’s sluggish performance and increased fuel use with no obvious misfire, it’s worth running a proper scan and live data check.

Replacement is straightforward for a trained tech but can be fiddly for DIY because the sensors sit beneath the intake manifold. Battery disconnected, intake gear off, clean mating surfaces, and correct torque on the sensor are the go—over-tightening can numb the sensor, while under-tightening can cause false readings. Always match the correct Toyota part number to the VIN, as plug styles and harness lengths can vary by market and engine. After refit, clear codes, confirm there are no vacuum leaks, and take a gentle test drive. When the sensor and its wiring are right, the Mark X feels perkier, pulls cleanly up hills, and keeps the engine safe without guzzling more fuel than it should.

• Signs to watch: check engine light (P0325/P0330), dull performance, poor economy, occasional pinging under load.
• Best practice: use quality fuel, keep cooling system in top nick, inspect wiring and connectors during major services.

Technical sources referenced: Toyota GRX130-series Repair Manual (Engine Control and Engine Mechanical sections for 4GR-FSE/2GR-FSE), Toyota Electronic Parts Catalogue (EPC) listings for “Sensor, Knock Control,” Toyota diagnostic documentation noting DTCs P0325 and P0330 for these engines.

Popular questions about the 2013 Toyota Mark X knock sensor

Does a 2013 Mark X have one or two knock sensors?
The V6 engines used in the 2013 Mark X generally run two knock sensors—one per bank—mounted in the valley of the engine. That lets the ECM adjust timing independently for each side, improving protection and performance.

Depending on exact engine code and market, the part numbers may be the same for both banks. Always confirm by VIN before ordering.

What are the symptoms of a faulty knock sensor?
Common signs include a check engine light with codes like P0325 or P0330, lazier acceleration, and higher fuel use. You might also hear pinging under load if timing isn’t being pulled back properly.

Because other issues can mimic these symptoms—like poor fuel quality, vacuum leaks, or ignition problems—a proper diagnostic scan with live data is the best first step.

Is it safe to drive with a knock sensor fault?
The car will usually default to a conservative timing map to protect the engine, so it’ll run but feel a bit flat. Short trips to a workshop are typically fine.

Prolonged driving with an active fault isn’t ideal. Get it checked to avoid potential engine stress or unnecessary fuel use.