Parts for your 2002 Ford Mondeo-Crank angle sensor

2002 Ford Mondeo crank angle sensor (crankshaft position sensor) — what it does and how to look after it

Based on technical sources including the Ford Workshop Manual for Mondeo 2001–2007 (WSM Sections 303-14/303-01), Ford ETIS/TIS service data, and the Haynes Mondeo Manual (No. 3506), the 2002 Ford Mondeo is fitted with a crank angle sensor — commonly called the crankshaft position (CKP) sensor. All main Mk3 engines (Duratec 1.8/2.0/2.5 petrol and Duratorq 2.0 diesel) use this sensor for engine management.

The CKP sensor reads a toothed reluctor on the crank to report exact crank angle and speed to the ECU. That signal is the timing heartbeat for spark, fuel injection, and misfire monitoring, and it syncs with the cam sensor for sequential injection. If the CKP drops out, the engine may not start or can stall — it’s that important.

• Typical symptoms: hard starting or no-start when hot, random stalling, rough idle or misfires, tachometer dropouts, poor fuel economy, and fault codes like P0335–P0339.
• Common causes: heat soak, wiring/connector corrosion, oil contamination, or metal filings on the sensor tip.

It’s not a scheduled service item, but it’s smart to give it a once-over during regular servicing. Under the bonnet, check the CKP harness for chafing, cracked insulation, or loose clips. Make sure the connector is clean, seated firmly, and free of oil or coolant wicking. In Aussie and Kiwi conditions — with heat, dust, and coastal air — corrosion and heat fatigue are the usual culprits, not the sensor element itself.

When replacement is needed, go for a quality OEM or reputable aftermarket sensor. A quick approach most home mechanics can follow:

1. Disconnect the battery negative terminal.
2. Locate the CKP: on Duratec petrols it’s typically at the bellhousing area reading the flywheel, some diesel variants place it at the front near the crank pulley.
3. Unplug the connector and remove the retaining bolt.
4. Withdraw the sensor, inspect for metal debris and clean the mounting bore.
5. Lightly oil the new O-ring, install, and tighten the bolt to the manufacturer’s spec (don’t overtighten).
6. Reconnect, clear codes, and road-test. A short idle relearn may help after battery-off.

If faults persist, check cam sensor sync, engine earths, and the CKP wiring back to the ECU before throwing more parts at it.

FAQs

Where is the crank angle sensor on a 2002 Ford Mondeo?

On most Duratec petrol engines it’s mounted on the engine block at the transmission bellhousing, reading a 36-1 tooth wheel on the flywheel. On some Duratorq diesel variants it can be positioned near the front crank pulley. Access ranges from straightforward from above to easier from underneath with the splash shield off.

What fault codes point to a bad CKP on a Mondeo?

Common codes include P0335 (CKP circuit), P0336 (range/performance), and sometimes P0337–P0339 (low/high signal, intermittent). Pair those with symptoms like no-start when hot, unexpected stalling, or a dead tacho, and the CKP circuit is a prime suspect. Always check wiring and connectors before replacing the sensor.

Does the crank angle sensor need regular replacement?

No, it’s not a consumable. Replace it only when there are confirmed faults. In Australia and New Zealand, parts typically run from modest pricing depending on brand, and labour is about 0.5–1.0 hour depending on engine and access. Spending a few extra dollars on a known-good brand usually saves headaches.