P0340 indicates a fault in the camshaft position sensor A circuit; it does not, by itself, prove that the sensor has failed. Published estimates vary by repair and vehicle: Fixxr puts an underlying P0340 repair at $130–$590 at an independent shop, while A-Premium gives a rough US shop budget of $200–$350 for a straightforward sensor replacement, before tax and diagnostic charges. These are different scopes, not guaranteed prices for your car.
How much does it cost to fix P0340?
The final bill depends on what testing finds. A faulty sensor may be a relatively straightforward repair, while damaged wiring, a connector fault, a missing circuit supply or ground, or a verified mechanical timing or target problem calls for different work. Vehicle access, local labour rates, parts choice, diagnostic charges and taxes also affect the estimate.
| Estimate or example | What it covers—and what to keep in mind |
|---|---|
| $130–$590 | Fixxr’s estimate for fixing the underlying P0340 problem at an independent shop, including parts and labour. It is a broad repair range, not a sensor-only price or a quote for every vehicle. |
| $200–$350 | A-Premium’s rough US shop budget for a straightforward camshaft position sensor replacement, before taxes and diagnostic charges. Access and local rates can move the price outside this range. |
| About $200 or $350 | CarBuzz’s Mazda CX-5 example: about $200 for a vehicle equipped with cylinder deactivation and about $350 for one without it. These are model-specific examples, not prices to apply to other vehicles. |
CarBuzz also reports a camshaft sensor price of about $100–$300 and a shop-scan example of $35–$100. Those figures are source-specific: the part price is not a complete installed repair cost, and scan charges vary. A scan may be available through a repair facility, parts store or an owner’s OBD-II scanner, but do not assume a shop scan is free.
For a more serious, vehicle-dependent example, CarBuzz reports a timing-chain repair estimate of $1,600–$1,900, citing RepairPal. That is not a typical P0340 bill and should not be assumed necessary because the code is present. A timing-related repair should be based on diagnostic confirmation.
Ask the shop for an itemised estimate showing the diagnostic charge, parts, labour, taxes and any confirmed wiring or mechanical work. If a sensor is proposed, ask what test confirmed it was faulty. Buying or replacing a sensor before diagnosis can leave the underlying circuit or timing problem unresolved.
Are there P0340 repair costs for Nissan, Ford, Chevy or Mercedes?
The available estimates do not establish reliable make-specific prices for Nissan, Ford, Chevy or Mercedes. A P0340 repair cost for any of these brands depends on the exact year, model, engine, access to the component and confirmed cause. Request a quote using the vehicle’s VIN and the diagnostic findings rather than treating a general sensor estimate as a brand-specific price.
What does code P0340 mean, and what do Bank 1 and Bank 2 refer to?
P0340 is described as a camshaft position sensor A circuit fault or malfunction. “Circuit” matters: the code reports a problem detected in the sensor circuit, but does not identify the failed component on its own. The fault could involve the sensor, its wiring or connection, its circuit supply or ground, or—if indicated by further testing—a mechanical timing or target issue.
For a Chevy, P0340 has this same general code meaning. The sensor’s location and the correct diagnostic procedure depend on the particular Chevy model and engine; the code alone does not tell you which part to replace. The same qualification applies to Nissan, Ford and Mercedes vehicles.
Bank 1/Bank 2 and sensor A/B are location labels that must be interpreted using vehicle-specific service information. Do not assume that “Bank 2” has one universal meaning or that a code description identifies a sensor’s physical position across all engines. For more detail on the camshaft position sensor A circuit on Bank 1, see our related guide.
A scan tool reports codes, not a complete diagnosis. KBB notes that P0340 may appear with codes in the P0341–P0349, P0011–P0019 or P0335–P0339 groups. These companion codes can help guide diagnosis, but do not prove that a particular part has failed. If P0342 is also present, our guide explains how the related P0342 circuit-low code differs.
How is P0340 diagnosed and fixed?
A diagnosis-first process helps avoid replacing parts by assumption. The checks should follow the vehicle’s service information because circuit design, sensor location and access differ by model and engine.
- Confirm the code. Scan the vehicle to confirm P0340 is active and note any other stored codes. A code scan is a starting point, not proof of the root cause.
- Inspect the relevant connector and wiring. Look for a damaged or poorly connected plug, or visible wiring damage around the applicable sensor and circuit.
- Check the circuit. Verify power, ground and signal using the vehicle-specific procedure and appropriate tools. Testing a pulse signal or interpreting electrical readings may require technician-level equipment and experience.
- Assess the sensor. Test it according to the applicable procedure and replace it only if the results confirm it has failed.
- Investigate other causes when indicated. If the circuit and sensor checks do not explain the fault, further diagnosis may need to assess a mechanical timing or target-related problem.
The repair should match the confirmed fault: repair damaged wiring or a connection, restore a missing circuit supply or ground, replace a sensor that has tested faulty, or correct a verified mechanical timing or target issue. A new sensor will not fix damaged wiring or a timing fault. Do not replace both position sensors or a timing set solely because P0340 is present.
If you cannot safely carry out or interpret electrical tests, ask a qualified technician to diagnose the circuit before authorising parts. For more on symptoms and diagnosis of a failing camshaft position sensor, see our related guide; symptoms can help inform a diagnosis but do not confirm the cause by themselves.
How long can you drive with a P0340 code?
The available evidence does not establish a safe number of miles or hours, or guarantee that a particular vehicle is safe to drive based on P0340 alone. The code does not reveal the root cause or its severity. Arrange prompt, vehicle-specific diagnosis rather than relying on a general driving-duration rule.
Is P0340 a crankshaft sensor code?
No. P0340 concerns the camshaft position sensor A circuit; a crankshaft sensor is a different component. P0340 alone does not establish that a crankshaft sensor needs replacement. The available research does not support a dependable labour-time estimate for replacing a crankshaft sensor, which would also depend on the exact vehicle and repair procedure.