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Parts for your 2002 Toyota Bb-Crank angle sensor
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2002 Toyota bB crank angle sensor — what it does, why it matters, and how to look after it
Yes, the 2002 Toyota bB does use a crank angle sensor (Toyota calls it the crankshaft position sensor, NE signal). This is documented in Toyota’s NCP30/31/35 bB Repair Manual for the 1NZ-FE/2NZ-FE SFI system, the matching Electrical Wiring Diagram for that model year, and DENSO’s application data for the 1NZ-FE, all of which list and illustrate an NE crank signal sensor at the timing chain cover. The same engine control setup appears in the closely related early Scion xB/XP30 service information.
On the 1NZ-FE/2NZ-FE, the crank angle sensor reads teeth on the crankshaft’s reluctor wheel to tell the ECU exactly where the crank is and how fast it’s spinning. That timing data lets the ECU fire the coils and injectors bang-on, adjust VVT-i, and keep the idle smooth. If the sensor drops out, the bB can be hard to start, stall at lights, or throw codes like P0335/P0336.
There’s no fixed replacement interval in Toyota’s schedule because the sensor is a solid-state unit. Still, it pays to check it during routine servicing. Look for oil seepage into the connector, frayed wiring near the plug, or metal debris stuck to the sensor tip (on magnetic/VR types). If the car shows long crank, random stalling, or a dead tacho, scan it for codes before throwing parts at it.
- Common symptoms: extended cranking, no-start, intermittent cut-out, rough running, MIL on with P0335/P0336.
- Preventative care: keep the area around the timing cover clean and dry, repair any oil leaks that could wick into the loom.
Replacement is straightforward for a home mechanic with axle stands and a decent socket set. Always follow factory procedures, but the flow typically looks like this:
- Disconnect the battery negative and let the car cool.
- Access from under the front: remove the plastic undertray. The sensor sits on the lower timing chain cover, near the A/C compressor.
- Unplug the connector, remove the retaining bolt, and withdraw the sensor. Expect a snug O-ring.
- Lightly oil the new O-ring, seat the new sensor, and tighten the bolt to the factory spec (about 9 N·m). Reconnect the plug.
- Refit the undertray, reconnect the battery, clear DTCs, and road test. No special relearn is usually needed.
Quality matters here—an OE-grade DENSO sensor and a clean connector can save a lot of chasing your tail. If in doubt, confirm part numbers by VIN and stick with known-good brands.
Where is the crank angle sensor on a 2002 Toyota bB?
It’s mounted in the lower section of the timing chain cover at the front of the engine, typically on the radiator side near the A/C compressor. On many cars it’s easiest to reach from underneath after removing the plastic undertray.
What fault codes point to a bad crank angle sensor?
P0335 (Crankshaft Position Sensor “A” Circuit) and P0336 (Range/Performance) are the usual suspects. Before replacing, check the connector for oil contamination, damaged pins, and wiring rubbed through on brackets, as those can trigger the same codes.
Does the ECU need a relearn after sensor replacement?
On the 1NZ-FE/2NZ-FE, no special crank relearn is typically required. Clear the codes, start the car, and let it idle for a few minutes, then take a gentle drive so the ECU can trim fuel and timing as normal.
