What do P0335 and P0340 together mean?
Quick answer
P0335 identifies a crankshaft position sensor A circuit record, while P0340 identifies a camshaft position sensor A circuit record for Bank 1 or a single-sensor setup in the cited Ford reference. They are separate monitor records, not proof that both sensors are defective. Exact interpretation and next steps depend on the vehicle. Gather its year, make, model, engine, code status, symptoms, and freeze-frame context for a qualified diagnostic check. [S1]
The question, the details, the next step.
What does it mean if my vehicle has both P0335 and P0340?
In the cited Ford OBD reference, P0335 means crankshaft position sensor A circuit, and P0340 means camshaft position sensor A circuit (Bank 1 or a single-sensor setup). The reference describes their monitors separately and gives engine cranking or running as typical monitor-entry conditions. [S1]
Together, the records point to two position-sensor circuits being flagged; they do not prove that both sensors have failed. The source is specific to its Ford applications, so treat these definitions as a starting point—not a vehicle-specific diagnosis. The exact diagnostic procedure depends on the vehicle and its applicable service information.
Should I replace both sensors, or does this pair tell me which one is bad?
This pair alone does not identify a failed part or establish that either sensor needs replacement. The Ford reference explicitly lists separate monitors and does not say that two records mean two defective sensors. [S1]
Before authorizing parts, ask the qualified technician to confirm the codes against your exact year, make, model, and engine; distinguish current, pending, or stored records; and review available freeze-frame context and the applicable service diagnostic procedure. Those details help frame the investigation without assuming a cause. Avoid treating a code description as a parts list.
What information should I write down before booking a diagnostic check?
Make a short, factual note rather than trying to test or repair the circuits yourself. Record:
- Year, make, model, and engine, if known.
- Both exact codes and whether the scan tool shows them as current, pending, or stored; if you are unsure, copy the display wording.
- Whether the vehicle cranks, starts, stalls, or shows another symptom—and when you noticed it. Write “no symptoms noticed” if applicable.
- Available freeze-frame details, copied as shown, and when the codes were read.
Freeze-frame context is worth gathering because the supplied reference specifically says to confirm it; it does not prescribe one universal interpretation for every vehicle. [S1]
Can you show me how to ask for a useful check without telling the shop what part to replace?
Yes. Here is a copyable request; replace the bracketed fields with your details and leave unknown items marked “unknown.”
“Vehicle: [year, make, model, engine]. Scan results: P0335 [status] and P0340 [status], read on [date/occasion]. Symptoms: [what happens, or none noticed]. Freeze-frame information: [copy details, or unavailable]. Please confirm what these codes mean for this exact vehicle and review the applicable service diagnostic procedure before recommending parts. What findings support the recommended next step?”
That wording keeps the request focused on vehicle-specific confirmation and evidence. The cited Ford source does not establish the cause for other makes or engines, nor does it provide a complete diagnostic procedure for your vehicle. [S1]
A practical checklist
Write down the exact year, make, model, and engine; mark unknown details rather than guessing.
Copy both codes and the displayed status for each, such as current, pending, or stored.
Describe starting, stalling, or other observed symptoms, including when they occur—or note that none are noticed.
Save available freeze-frame information as displayed; do not infer a cause from it.
Ask a qualified technician to confirm vehicle-specific definitions and consult the applicable service diagnostic procedure before recommending parts.
A few more useful answers
Does having both codes mean the crankshaft and camshaft sensors failed at the same time?
No. The cited Ford reference lists separate circuit monitors and does not establish that both sensors are defective when both records appear. [S1]
Do these Ford code definitions apply to every vehicle?
The source is limited to its Ford applications. Confirm the meaning and procedure for your exact year, make, model, and engine using applicable service information. [S1]
What if I do not have freeze-frame information?
Mark it as unavailable and share the code status and observed symptoms you do have. Ask the technician whether relevant context is available and what vehicle-specific checks are appropriate.
Sources
References used for this guide.
- [S1] Ford OBD System Operation Summary, 2018: Camshaft and Crankshaft Sensor Monitors fordservicecontent.com · Checked