The engine ECU has lost or doubts the crankshaft sensor signal. On VAG engines this is a classic cause of cutting out when hot and then refusing to restart until it cools.
P1335 — also written P1335, P 1335, 1335 — is the OBD-II code for crankshaft position sensor circuit / signal fault. Same code, same fix: this page covers every spelling of it.
P1335 is a sensors fault code, typically costing £90–£280 to put right in a UK garage.
What causes P1335?
- Failed crankshaft position sensor
- Oil-soaked or damaged connector
- Chafed sensor wiring
- Damaged reluctor ring on the flywheel
How P1335 is fixed
- Check live data for a steady rpm signal while cranking
- Inspect the connector and wiring
- Replace the sensor with a quality part
- Inspect the reluctor ring if a new sensor does not cure it
P1335 repair cost in the UK
Most P1335 repairs land between £90–£280 including parts and labour. The spread is wide because the cheap fix (a sensor, a hose, a leak) and the expensive fix (a major component) throw the same code — which is why a proper diagnosis before parts are bought saves the most money.
Can you drive with P1335?
Risky. The engine can cut out without warning, including at speed, so fix it before relying on the car.
Urgency: high.
What P1335 is telling you
This code is the ECU saying the engine is not behaving the way its map predicts. The job in the workshop is finding which link in that chain is lying.
On P1335 specifically — crankshaft position sensor circuit / signal fault — the stored code records the moment that check failed, not the moment the part gave up. That gap is why two cars with the same code can need completely different repairs.
How P1335 is diagnosed properly
Each of the known causes is ruled in or out in cost order, cheapest and most likely first. On P1335 that means working through them like this:
- Failed crankshaft position sensor — compared against live data and a known-good reference before it is condemned — a sensor reading the wrong thing accurately is a different fault from a dead one.
- Oil-soaked or damaged connector — opened, inspected for green corrosion and spread pins, and back-probed rather than unplugged, so the reading is taken with the circuit live.
- Chafed sensor wiring — checked with the loom flexed and the engine warm, because a wiring fault that is intermittent when cold shows itself under heat and vibration.
- Damaged reluctor ring on the flywheel — confirmed with live data before any part is bought.
An hour of diagnostic time on P1335 routinely saves more than it costs, because the alternative is buying the most expensive part on that list and hoping.
The repairs that actually clear P1335
- Check live data for a steady rpm signal while cranking
- Inspect the connector and wiring
- Replace the sensor with a quality part
- Inspect the reluctor ring if a new sensor does not cure it
After the repair the code is cleared and the car is driven until the relevant readiness monitor completes, rather than handed back as soon as the light goes out. A code that has only been erased will come straight back on the next drive cycle.
What happens if P1335 is ignored
Leaving this one is the expensive choice. The protection strategy the ECU falls into is there to limit damage, and every mile driven with the fault active is a mile the engine or gearbox spends outside its designed operating window.
For reference, P1335 typically lands at £90–£280 all-in at an independent garage in the UK — main-dealer quotes for the same job usually sit above that.
Getting P1335 looked at
Bob's Mechanical Repairs is an independent garage in Birnam, Dunkeld, Perthshire, with 32 years of Bob's experience on the tools. If P1335 is showing on your car, bring the scan results with you — we will read the live data ourselves, tell you which of the causes above it actually is, and price the repair before any work starts.