← Back to list

P0340 Fault in Plymouth Neon: Camshaft Position Sensor A Bank 1 Circuit Malfunction Diagnosis and Repair Cost

Model: Ply Neon Fault Code: P0340 Posted: 2007-04-03 15:49

While driving today, my check engine light activated, followed by noticeable engine hesitation and reduced performance a few miles later. I recently replaced all spark plugs and ignition wires, but the issue persisted—previously, the car exhibited shifting problems. After connecting the OBD2 scanner, I received diagnostic code P0340: Camshaft Position Sensor A - Bank 1 Circuit Malfunction. Given this error, I'm seeking clarification on what component to replace in my Plymouth Neon and whether the repair will be expensive or manageable without major costs. Any insights into common causes or troubleshooting steps would be greatly appreciated.

Related fault codes
P0340
Comments (3)
Anonymous 2007-04-03 17:05

The camshaft position sensor is likely the culprit. It's located at the end of the camshaft on the driver's side of the engine, just below the valve cover. Oil leaks from its o-ring are common and can cause intermittent failures. However, without knowing the exact model year or engine type, I can't provide more specific guidance.

Anonymous 2007-04-04 14:08

While a camshaft sensor is a likely cause, Plymouth Neons have a known electrical quirk: the Vehicle Speed Sensor (VSS) shares the same 8-volt power supply as the cam and crank position sensors. If the VSS shorts, it can disrupt the 8-volt signal, leading to intermittent no-start conditions. To test this, unplug the VSS (located on the transmission extension housing with a three-wire connector). If the engine starts after removal, then the issue is likely the VSS. If not, the problem remains with either the camshaft or crankshaft position sensor.

Anonymous 2007-04-04 14:59

Wiring issues affecting the crankshaft sensors, alternator, or coil pack could also contribute to this fault. These components may introduce intermittent signals that mimic P0340 symptoms, so it's worth checking for loose connections or corrosion in related wiring harnesses.