Parts for your 2008 Toyota Avensis-Camshaft sensor

2008 Toyota Avensis camshaft sensor — what it does, and how to look after it

Technical sources confirm the 2008 Toyota Avensis is fitted with a camshaft position sensor across its common engines (petrol: 1ZZ‑FE, 1AZ‑FE/1AZ‑FSE, diesel: 1CD‑FTV early, 2AD‑FTV/2AD‑FHV). Toyota service information (TIS) and the Avensis T25/T250 Repair Manual list the Camshaft Position Sensor (CMP, often labelled “G”/“G2”) as an input for sequential fuel injection, VVT‑i/valve timing control and misfire monitoring. Toyota’s European parts catalogue (EPC) also lists a “Sensor, Cam Position” for these engines, aligning with independent data sets from Autodata/Haynes and typical Denso OE fitment.

On a 2008 Avensis, the camshaft sensor lets the engine control module know exactly where the cam is in its rotation, so it can sync injection and ignition with the crankshaft signal. That precise timing is what makes for easy starts, smooth idle, good fuel economy and proper VVT‑i operation. If it goes out of whack, you’ll often see a check‑engine light, long cranking, rough running, limp‑home behaviour or stored fault codes like P0340–P0343 and cam/crank correlation codes.

• Common symptoms: hard starting, misfire at low revs, poor fuel economy, intermittent stalling, and the MIL on.
• Typical causes: internal sensor failure, oil ingress at the connector, damaged wiring near the rocker cover, or metal debris on magnetic tips.

There’s no scheduled replacement interval for the CMP, it’s a monitor-and-repair item. During major services, it’s worth a quick look under the bonnet: check the connector for oil weep, brittle insulation and loose clips, especially where the harness runs across the cylinder head. Healthy oil changes also help the VVT gear behave, reducing false correlation faults that can mimic sensor issues.

Replacement is a straightforward driveway job on most Avensis variants:

1. Remove the plastic engine cover and locate the sensor at the cylinder head on the timing chain/belt end.
2. Unplug the connector, remove the single hold‑down bolt (typically 10 mm head), and ease the sensor out without levering on the plastic.
3. Lightly oil the new O‑ring, seat the new sensor, and tighten the bolt to about 8–10 Nm (typical Toyota spec for an M6 hold‑down).
4. Reconnect, clear fault codes, and road‑test. A short idle relearn may follow, the ECU will sort itself after a few kilometres.

Go for a quality OE‑grade unit (Denso is the usual original supplier). If a code returns, don’t overlook basics: harness continuity, the crank sensor, or timing chain stretch on high‑kilometre cars can all trigger similar diagnostics.

FAQs

Where is the camshaft sensor on a 2008 Avensis?
It’s mounted on the cylinder head at the timing end, just under the engine cover. On both petrol and D‑4D diesels, you’ll find it near the cam pulley/chain area with a single retaining bolt and a two‑ or three‑pin plug.

Can I drive with a faulty camshaft sensor?
You might get home, but it can be a rough run. Expect long cranking, limp mode or occasional stalling. Best to sort it promptly to avoid roadside dramas and protect the catalytic converter or DPF from misfire‑related issues.

How many camshaft sensors does a 2008 Avensis have?
Most 2008 Avensis engines use one camshaft position sensor plus a separate crankshaft sensor. If unsure, check by VIN in the parts catalogue before ordering.