Camshaft Position Sensor B Circuit (Bank 1)
What it means
The engine computer is not receiving a valid signal from camshaft position sensor B on bank 1. On engines with a sensor on each camshaft, sensor B is usually on the exhaust camshaft, so the computer normally disables exhaust cam timing control on this bank.
Related lights
Dashboard lights that may come on with this code.
Symptoms4
- Check engine light on.
- Reduced power because exhaust cam variable valve timing (VVT) is disabled.
- Long cranking on some vehicles.
- Occasional slight roughness at idle.
Possible causes6
- Failed camshaft position sensor B.
- Corroded or loose connector, or oil leaking into it.
- Broken or chafed sensor wiring.
- Faulty sensor supply or ground.
- Damaged tooth wheel read by the sensor on the camshaft.
- Faulty engine computer (rare).
How to diagnose5
- Confirm where sensor B is on this engine from the service manual so it is not confused with sensor A.
- Inspect the connector and wiring for oil, corrosion or chafing.
- Measure supply voltage and ground at the connector and compare them with the manufacturer specification.
- Watch the sensor signal while cranking with a scan tool or an oscilloscope.
- If sensors A and B are identical, swap them; if the code moves to P0340, the sensor is faulty.
How to fix5
- Clean the connector and repair loose terminals.
- Repair damaged wiring and fix any oil leak into the connector.
- Replace camshaft position sensor B with a matching part.
- Inspect the tooth wheel if a new sensor does not solve the problem.
- Clear the codes and confirm the code does not return after several drive cycles.
Repair cost
In Saudi riyals; the highlighted part is the expected range for this fault.
In the Saudi market: SAR 100–600 (≈ USD 27–160)
Our prices come from the Saudi market, converted at a fixed rate (SAR 3.75 per USD). Prices in your country may differ a lot, so we show the cost level.
The cost is low when the connector or wiring is at fault, and rises somewhat when the sensor is replaced, depending on how easy it is to reach.
Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026
Frequently asked questions
What is the difference between sensor A and sensor B?
Under the SAE convention, sensor A is usually on the intake camshaft and sensor B on the exhaust camshaft on engines with two camshafts per bank, but check your vehicle's service manual.
Will this code stop the car from starting?
Rarely, because the computer can usually rely on sensor A and the crankshaft sensor, but performance drops and exhaust cam timing control is disabled.
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