P0325 means the ECU sees an out-of-range voltage on the bank 1 knock sensor circuit. Without valid knock data the ECU defaults to conservative ignition timing, so you lose power and fuel economy.
P0325 means the ECU sees an out-of-range voltage on the bank 1 knock sensor circuit. Without valid knock data the ECU defaults to conservative ignition timing, so you lose power and fuel economy.
P0325 is a electrical-related diagnostic trouble code classified as moderate severity. When your vehicle's ECU detects this condition, it stores P0325 and illuminates the check engine light.
If your vehicle has triggered P0325, you may notice one or more of these symptoms:
Here are the most common causes of P0325, ranked by how likely they are to be the culprit:
Generally yes, for short-term driving. You can drive short distances, but the ECU pulls timing as a protection measure. Expect reduced power and worse fuel economy. Avoid heavy throttle and low-octane fuel until it's fixed.
Follow these steps to pinpoint the root cause of P0325:
Repair costs for P0325 vary depending on the root cause and your vehicle. Here are typical estimates:
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
P0325 behaves differently depending on your vehicle. Select your car below for model-specific causes, known issues, and adjusted cost estimates:
Toyota Camry
See Toyota-specific causes & costHonda Civic
See Honda-specific causes & costVolkswagen Golf
See Volkswagen-specific causes & costChevrolet Silverado
See Chevrolet-specific causes & costBMW 3 Series
See BMW-specific causes & costThese codes are often seen alongside P0325 or indicate related issues:
Not on its own. With no valid knock signal the ECU pulls timing as a safeguard, so detonation is unlikely on decent fuel. The risk is that real knock could occur without being detected. Fix it within a few weeks, not months, and stay on 95 RON or higher in the meantime.
Nine times out of ten it's the harness, connector, or a cheap aftermarket sensor. Denso, Bosch, and NTK OEM units are worth the extra €20-€40, especially on Toyota 1MZ/2GR V6s and GM LS engines where generic sensors often fail within a year.
Low-octane fuel causes real knock, which usually sets P0324, P0327 or P0328, not P0325. P0325 is a circuit fault, meaning voltage out of range. If you filled up with cheap fuel and the light came on, scan it before assuming the sensor is bad.
On a 4-cylinder with the sensor on the side of the block (Civic R18, most Mazdas), it's a 30-minute job with a 10mm socket and an extension. On a V6 or V8 with the sensor in the lifter valley (Toyota 2GR, GM LS, BMW N52), plan a full day and budget for new intake manifold gaskets.
Yes. In most EU countries and US states an active MIL is an automatic fail, regardless of the specific code. Readiness monitors also won't set until the code is cleared and a full drive cycle is completed, so don't clear it right before your inspection.
A flashing check engine light is not the same as a steady one. It almost always means an active misfire that can wreck your catalytic converter in minutes.
An unfamiliar light just appeared on your dashboard and you have no idea what it means. Here is how to read every symbol by colour and which ones mean stop now.
Your car logged P0325. Skanyx reads it on any standard Bluetooth OBD2 adapter, tells you whether it is safe to keep driving, and shows the €90-€1600 repair range so you know the number before a shop quotes you.
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