Parts for your 2019 Toyota Camry-Knock sensor

2019 Toyota Camry knock sensor — what it does and when to replace it

Technical verdict: the 2019 Toyota Camry is fitted with a knock sensor (the 3.5‑litre V6 has two). This is documented in Toyota’s factory Repair Manual for the 2018–2021 Camry under the SFI System diagnostics, which includes DTCs P0325, P0327, P0328 and (for the V6) P0330 relating to knock sensor circuits. Toyota’s Electronic Parts Catalogue also lists a “Sensor, Knock (Knock Sensor Sub‑Assembly)” for both A25A‑FKS/FXS 2.5‑litre and 2GR‑FKS 3.5‑litre engines.

On a 2019 Camry, the knock sensor is the engine’s ears. It listens for pinging (detonation) and lets the ECU trim ignition timing and, if needed, fuel, so the car runs smoothly on local fuels and under all loads. That protects the pistons and head while keeping power and economy consistent, whether it’s a quick dash to the servo or a long cruise up the motorway.

It’s not a scheduled maintenance item, so there’s no routine replacement interval. The 2.5‑litre four usually has a single sensor mounted on the block beneath the intake manifold, the 3.5‑litre V6 uses two sensors in the valley between the cylinder banks. When one plays up, the ECU will often throw a Check Engine Light and log a fault code. The car may feel a bit flat because the ECU dials back timing to stay safe.

• Common signs of a crook knock sensor: Check Engine Light with codes like P0325/P0327/P0328 (plus P0330 on the V6), pinging under load, sluggish performance, and higher fuel use.
• Good practice when replacing: disconnect the battery, remove the intake components as required, keep the mating surface clean and dry, orient the sensor correctly, and tighten to the factory torque with a torque wrench. Don’t use sealant on the mounting face.
• After refit: clip the loom back exactly as Toyota intended, clear codes, and road‑test under moderate load while watching for timing correction and knock activity with a scan tool.
• Helpful prevention: use quality fuel that meets Toyota’s recommendation for your market, keep the cooling system healthy, and fix any oil or vacuum leaks that can provoke knock.

Access on both engines can be fiddly because the sensor sits under the manifold, so fresh gaskets are a smart idea if the intake comes off. If you’re not set up with a torque wrench and a scan tool, having a technician handle diagnosis and replacement will save time and drama.

Popular questions about the 2019 Toyota Camry knock sensor

Does a 2019 Camry have a knock sensor, and how many?
Yes. The 2.5‑litre four has one knock sensor mounted on the engine block under the intake manifold. The 3.5‑litre V6 uses two sensors, one for each bank, tucked in the valley beneath the upper intake.

Where is the knock sensor located on a 2019 Camry?
On the 2.5‑litre A25A engine it’s bolted to the block, generally accessed by removing the intake manifold. On the 3.5‑litre 2GR‑FKS V6, the pair of sensors sit in the “V” of the engine under the upper plenum, so the intake gear needs to come off for access.

Is it safe to drive with a bad knock sensor?
The car will usually run, but the ECU may pull timing to protect the engine, which means less punch and worse fuel economy. If there’s active detonation that the ECU can’t control, engine damage is possible. Best bet: get it scanned and repaired sooner rather than later.