Nissan P0105 Manifold Pressure Sensor: How to Fix

Fault-Code Fix

By iCarsoft Technical TeamJuly 2, 20266 min read

A Nissan with the engine management light on and the occasional loss of power — and a stored P0105 code — usually comes down to the inlet manifold pressure sensor circuit. Because the code says “circuit,” it’s an electrical fault: fuse, wiring, or the sensor itself. Here’s how to track it down and fix it, with a live-data check using an iCarsoft CR Max P.

Quick Answer

P0105 is a manifold (MAP) pressure sensor circuit fault. Check the fuse and wiring first, confirm the sensor has power, then clean or replace it (a single small bolt, plug-and-play). Verify with live data — the manifold pressure reading should drop to 0 when you unplug the sensor and return to a real value when plugged in — then clear the code.

Key takeaways

P0105 = inlet manifold / MAP pressure sensor circuit fault (electrical, not a specific reading).
Most likely causes: blown fuse, damaged wiring, or a faulty sensor.
Confirm the fix with live data: reading goes to 0 when unplugged, real value (~1.6) when connected.
DIY-friendly — try cleaning the sensor first, fit an OEM one if needed, then clear the code.

What P0105 means

P0105 is a manifold absolute pressure (MAP) / inlet manifold pressure sensor circuit fault. The key word is circuit: the ECU has flagged an electrical problem in the sensor’s wiring or supply rather than an out-of-range pressure value. On the Nissan Micra 0.9 in the video, it showed up as an engine management light with occasional power loss.

Symptoms

Engine management light on.
Occasional loss of power / hesitation.
Sometimes rough running or reduced throttle response.

Common causes

Because it’s a circuit fault, work through these in order — cheapest and easiest first:

Fuse — quick to check and rule out.
Wiring / connector to the manifold pressure sensor — these can chafe, corrode or get cut.
The sensor itself — dirty or failed.

Location of the inlet manifold pressure sensor on a Nissan Micra 0.9 engine — The manifold pressure sensor is held by a single small bolt — easy to remove for cleaning or replacement.

Watch the fix

Video credit: Nissan P0105 Inlet Manifold Pressure Sensor Circuit — How To Fix, by SA Diagnostic’s. Independent third-party demonstration.

Step-by-step fix

Plug in the iCarsoft CR Max P, run a scan and confirm P0105. Note the sensor’s part number if shown.
Check the relevant fuse — replace if blown.
Inspect the wiring and connector to the manifold pressure sensor for damage; confirm the sensor is getting the correct voltage.
Remove the sensor (usually one small bolt) and clean it with an electrical contact cleaner. Refit and re-test.
If the fault persists, fit an OEM genuine sensor — it’s plug-and-play. Avoid dubious used sensors that may not clear the code.
Clear the codes and re-scan; the code should now be gone.

Verify with live data

This is the satisfying part. On the CR Max P, open live data and view the manifold pressure parameter. With the sensor plugged in and powered, it reads a real value (around 1.6 in the video). Unplug the sensor and the reading drops straight to 0 — proving the circuit and the tool are seeing it correctly. Plug it back in and it jumps to the live value again. If it reads 0 with the plug in, the sensor isn’t getting power or has failed.

iCarsoft CR Max P live data showing the manifold pressure value on a Nissan Micra — Live data confirms the sensor: a real manifold-pressure value with the plug in, 0 when unplugged.

iCarsoft CR Max P showing no stored fault codes after fixing Nissan P0105 — After the repair and a full scan-and-clear, no fault codes remain.

iCarsoft CR Max P — $599.99

Price at time of writing — check the product page for current pricing.

Shop the CR Max P →

When to see a professional

P0105 is a straightforward DIY job, but if the code returns immediately after a new sensor, if you find damaged wiring you can’t trace, or if there are other running faults alongside it, have a qualified technician check the harness and ECU supply before spending more on parts.

Frequently asked questions

What does P0105 mean on a Nissan?

It’s a manifold absolute pressure (MAP) / inlet manifold pressure sensor circuit fault — an electrical problem in the sensor’s circuit, usually the fuse, wiring, or the sensor itself.

What causes a P0105 code?

Because the code says “circuit,” the usual culprits are a blown fuse, damaged/cut wiring to the sensor, or a faulty sensor. Check power and the harness before replacing parts.

Can I fix P0105 myself?

Yes — it’s DIY-friendly. Check the fuse and wiring, confirm the sensor has voltage, then clean or replace it. The sensor is usually one small bolt and plug-and-play.

How do I test the manifold pressure sensor?

Use live data on the CR Max P: view the manifold pressure PID. Connected and powered it shows a real value (~1.6); unplug it and it drops to 0. Reading 0 with the plug in means no power or a failed sensor.

Should I clean or replace the sensor?

Try cleaning it with an electrical contact cleaner first. If that doesn’t fix it, fit an OEM genuine sensor — it’s plug-and-play. Avoid low-quality used sensors that may not clear the code.

Which iCarsoft tool is used?

The iCarsoft CR Max P ($599.99) — it reads/clears codes and streams the live data used to verify the sensor.

Will P0105 come back after clearing it?

If the wiring, power, or sensor fault isn’t actually fixed, yes. After the repair, do a full scan-and-clear and confirm the manifold pressure reads correctly in live data.

Disclaimer: Diagnostic and repair steps are general guidance — verify procedures and part numbers for your exact model and year. If you’re unsure, consult a qualified technician. The embedded video is an independent third-party demonstration. Prices are accurate at the time of writing.