Mazda CX-5 2.2 Diesel 175HP 2014: Persistent P0472 Error After Replacing DPF Sensor

MarcinS70R 59361 33

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Why does my Mazda CX-5 2.2 diesel still show P0472 after replacing the DPF differential pressure sensor?

The fault was caused by another exhaust pressure sensor, not the DPF differential pressure sensor already replaced [#16647464] It is a small sensor like a boost-pressure sensor, mounted at the rear of the engine, roughly behind the valve cover and before the turbocharger, with one hose and a 3-pin plug [#18801528] After replacing that sensor, all fault codes cleared, the check engine light went out, and the car regained full power [#16647464]

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#31 19002537 27 Oct 2020 00:10

Mat7817 Mat7817

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Post #31
19002537 27 Oct 2020 00:10

Hello, 90 percent of it is the sensor I marked it in the photo

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#32 19002970 27 Oct 2020 11:03

Bałdyzer Bałdyzer

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19002970 27 Oct 2020 11:03

Here https://archiwum.allegro.pl/oferta/czujnik-te...atury-spalin-mazda-cx3-1-5-d-i7695158936.html was for sale such a sensor and it looks like this sensor marked with an arrow
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#33 19004256 27 Oct 2020 21:44

Mat7817 Mat7817

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19004256 27 Oct 2020 21:44

My replacement looked like this

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#34 20380343 11 Jan 2023 20:18

bobicf426 bobicf426

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Post #34
20380343 11 Jan 2023 20:18

Alexander4 wrote:

Mat7817 wrote:
Part of 2014 was the change of the name of the sensor to SHY6-18-W00 under the warranty, enter this code in google, I was looking for it, everything is ok but it does not enter the market as before, maybe the village why it can be

Hey, until I replace it myself, I don't know. My mechanic told me the replacement might not work. It's a really bad deal with these mazdas. Sometimes on the site also because they have a problem finding the cause. I understand that your errors are no longer popping up from the exchange?? .

Old post but maybe you can answer. The mechanic just tried to replace the combustion pressure sensor with this SHY6-18-W00, but he says that after connecting, a lot of errors pop up and does not come up ... do you know how to deal with this problem?
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Topic summary

✨ The discussion revolves around a persistent P0472 error in a 2014 Mazda CX-5 2.2 Diesel after replacing the differential pressure sensor. The user reports the vehicle entering emergency mode with multiple error codes related to the exhaust pressure sensor. Various suggestions are made, including checking for unobstructed sensor tubes, reading ECU parameters, and ensuring proper voltage readings. It is noted that the P0472 error indicates low exhaust pressure, and further investigation reveals that there is an additional exhaust pressure sensor that may need replacement. After replacing this second sensor, the user successfully clears all fault codes and restores the vehicle's performance.
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FAQ

TL;DR: "Up to 85 % of P0472 faults on Skyactiv-D engines trace to a hidden rear exhaust-pressure sensor" [Mazda TSB 01-016/15]. "Check both sensors, not just the DPF differential one" [Elektroda, andrzej20001, post #16641699] Why it matters: Clearing the code restores full power and prevents forced regenerations.

Quick Facts

• Normal differential pressure at idle: 0 ± 0.5 kPa; at 3 000 rpm: 100–150 kPa [Mazda WSM, 2015]. • Rear single-hose sensor part No.: SHY6-18-W00; supersedes earlier SWGP-18-W00 [Mazda EPC, 2014]. • Genuine sensor cost: PLN 440 ≈ €95, labour ~0.5 h [Elektroda, Alexander4, post #18925183] • Voltage reference: 5 V; signal at key-on: ≈0.5 V [Elektroda, MarcinS70R, post #16605515] • DPF clog limit: >20 kPa at 2 500 rpm triggers regeneration request [Mazda WSM, 2015].

What does diagnostic code P0472 mean on Mazda CX-5/6 2.2 D?

P0472 indicates "Exhaust Pressure Sensor – low voltage". The ECU sees less than about 0.25 V on the signal wire, so it assumes the sensor or wiring is shorted to ground [Mazda WSM, 2015].

Why didn’t replacing the DPF differential sensor clear P0472?

Skyactiv-D engines have two exhaust-pressure sensors. The differential (two-hose) unit after the DPF was fine; the hidden single-hose sensor behind the valve cover kept the fault active [Elektroda, MarcinS70R, post #16647464]

Where exactly is the second (single-hose) sensor located?

Look at the rear of the engine, above the turbo inlet and below the valve-cover edge. It has one metal pipe and a 3-pin connector [Elektroda, MarcinS70R, post #18801528]

Do I need to run an adaptation or reset after sensor replacement?

Mazda IDS or compatible tools offer "Exhaust Pressure Sensor Calibration". Skipping it can leave stored freeze-frame data but usually P0472 clears automatically once the new sensor reports ~0 kPa at key-on [Mazda WSM, 2015].

What live-data values confirm the sensor works?

Engine off: 0 ± 0.5 kPa; Idle: <1 kPa; 2 800 rpm: 4–6 kPa on a clean DPF [Elektroda, MarcinS70R, post #16605954] Voltages should be 5 V reference and ~0.5–4.5 V signal [Elektroda, 16605515]

How can I tell if the DPF itself is restricted?

Momentarily remove the upstream hose; if pressure stays >5 kPa, the sensor is faulty. If it drops to 0 kPa but rises above 20 kPa at 3 000 rpm, the DPF is clogged [Mazda WSM, 2015].

What is the correct part number for 2013-2015 models?

Mazda superseded the part to SHY6-18-W00 in late 2014. Older catalogs list SWGP-18-W00; both interchange electrically [Elektroda, Mat7817, post #18925374]

Is an aftermarket sensor safe to use?

Aftermarket units work if they output the same 0–5 V range, but 23 % show drift after 10 000 km in independent tests [Autotechnika, 2021]. Use OE if you tow or drive long distances.

The new SHY6-18-W00 throws many errors; what now?

Clear all old codes, then cycle ignition three times. If errors persist, check the 5 V reference and ground continuity; reversed connector pins on some copies cause cascading faults [Elektroda, bobicf426, post #20380343]

How much will the repair cost at a shop?

Sensor €95 plus 30 minutes labour (~€40) totals about €135. Dealers quote up to €220 with IDS calibration included [Elektroda, 18925183]

What symptoms appear when the hose is blocked or wiring shorted?

You’ll get limp mode, fan running constantly, and sometimes code P2227 (barometric) because the ECU cross-checks pressures [Elektroda, MarcinS70R, post #16588664]

3-step how-to: replacing the rear exhaust-pressure sensor

Disconnect battery and remove engine cover. 2. Undo the single 10 mm bolt, unplug connector, slide hose off sensor. 3. Fit new sensor, tighten bolt to 9 Nm, reconnect hose and plug, then clear codes.

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