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Parts for your 2013 Lexus Is-Knock sensor
2013 Lexus IS knock sensor: what it does, why it matters, and when to replace
Technical documentation issued by Lexus/Toyota—namely the 4GR‑FSE, 2GR‑FSE and 2UR‑GSE engine repair manuals, plus the Lexus Electronic Parts Catalogue for the 2013 IS range—confirms the 2013 Lexus IS is factory‑fitted with knock sensors. The V6 and V8 engines use two sensors (one per bank) mounted in the valley of the block under the intake manifold. So the knock sensor is absolutely relevant to any 2013 IS (IS 250, IS 350 and IS F).
The knock sensor’s job is to “listen” for detonation (knock) and let the engine control module trim ignition timing on the fly. That keeps the engine safe while squeezing the best performance and economy from Aussie and Kiwi fuels, whether it’s regular 91 RON or premium.
- Protects pistons and bearings from knock‑related damage
- Optimises timing for smooth power and better fuel economy
- Adapts to fuel quality, load, altitude and temperature
Typical fault signs include a check‑engine light with codes like P0325/P0327/P0328 (Bank 1) or P0330/P0332/P0333 (Bank 2), pinging under load, lazy performance, or increased fuel use. Because false knock readings can be caused by wiring or mounting issues, proper diagnosis with a scan tool and a visual inspection of the sub‑harness is smart.
It’s not a regular service item, but it benefits from sensible care. Keep the cooling system in good nick, avoid hard carbon build‑up, and use decent fuel. If major intake work is being done, a quick look at the harness routing and connector condition pays dividends.
- Replacement is a manifold‑off job on the 4GR/2GR/2UR engines. Budget several hours of labour.
- Disconnect the battery, remove the intake manifold, label hoses, and fit new manifold gaskets on reassembly.
- Install OEM or quality sensors only, mount them clean and dry—no sealant—facing the correct way.
- Torque the sensor bolts to the factory spec and route the sub‑harness exactly as shown in the repair manual to avoid noise or chafing.
- Clear codes, warm the car, and road‑test under load to confirm timing advance and no returning DTCs.
Given the access effort, many techs replace both sensors and the sub‑harness on high‑kilometre cars if one has failed. That’s a tidy bit of future‑proofing for a fresh start under the bonnet.
Popular questions about the 2013 Lexus IS knock sensor
1) Can a bad knock sensor damage the engine?
Left long enough, yes—if detonation isn’t detected and timing can’t be pulled, sustained knock can mark pistons and stress bearings. Often the ECU will play it safe with retarded timing, which protects the engine but feels sluggish and burns more fuel.
2) Do both knock sensors need replacing on a V6/V8?
Not always, but it’s common practice. Because access requires removing the intake, many owners opt to replace both sensors and the sub‑harness together to avoid paying the same labour twice if the other side fails later.
3) Will premium fuel fix a knock sensor fault?
Premium can reduce real knock, but it won’t fix a faulty sensor or damaged wiring. If a DTC is stored, the proper cure is diagnosis and repair—then choose the fuel grade recommended in the owner’s manual for best results.
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