Electronics & engine management 26 www.aftermarketonline.net JUNE 2026 Mazda 2.2 diesel: Exhaust pressure sensor diagnosis and replacement Replacement automotive parts specialist, febi, takes Aftermarket Magazine through the process of diagnosing a faulty exhaust pressure sensor on the 2.2 diesel engine fitted to Mazda 3, 6 and CX-5 models, and then explains the replacement process. If a Mazda 3, 6 and CX-5 equipped with the 2.2 diesel engine presents with the engine warning lamp illuminated, a lack of power and possible fault codes stored in the engine control unit, including ‘P0470 Exhaust gas pressure sensor. Malfunction’, ‘P0471 Exhaust gas pressure sensor. Outside specified range’, ‘P0472 Exhaust gas pressure sensor. Open circuit/signal too low’, ‘P0473 Exhaust gas pressure sensor. Signal too high’, ‘P0474 Exhaust gas pressure sensor. Malfunction’, or ‘P2262 Exhaust gas turbocharger. Electrical/ mechanical fault’, then the cause is likely to be a faulty exhaust pressure sensor, or the pipe from the exhaust to the sensor is blocked with carbon deposits. The solution After identifying the symptoms and fault codes, unplug the exhaust pressure sensor from the rubber hose and check the data with a suitable diagnostic tool. If the sensor is working correctly, it should read atmospheric pressure of approximately 1 bar. To test the sensor, attach a handheld vacuum/pressure pump and adjust the pressure, then compare it to the data on the diagnostic tool. If the sensor does not read correctly, then it is faulty. However, the metal pipe from the exhaust to the sensor is susceptible to becoming blocked with carbon deposits. Therefore, before replacing the sensor, it is important to check that the pipe is not blocked. If the sensor is confirmed as faulty, then it is important to note that the febi replacement Exhaust Pressure Sensor, 194893, follows the current updated design from the vehicle manufacturer. As such, it is possible that the sensor being replaced is of a different design from the original part fitted to the car. To replace the sensor, first remove the plastic engine cover, then unplug the electrical connectors from some of the injectors to make it easier to access the exhaust pressure sensor. Unbolt the original exhaust pressure sensor metal retaining bracket. Then discard the bracket but retain the bolts. Next, unplug the sensor from the rubber hose, then carry out comparative data tests to confirm the diagnosis. If confirmed, unplug the original sensor from the wiring harness and discard it. Remove the original rubber hose from the metal pipe and check for carbon deposits (figure 1). To fit the new sensor, first install the new shorter rubber hose from the kit and then fit the new metal bracket using one of the original retaining bolts. Then install the new sensor with the second part of the new metal bracket (figure 2). Plug the new adaptor wiring harness into the new sensor and the original wiring harness. Refit the injector wiring harness using the included cable ties to retain the adapter wire, then refit the engine cover. Then all that remains is to clear all known fault codes and road test the vehicle. partsfinder.bilsteingroup.com Figure 1. Figure 2.
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