DTC Code P1195 – What does this code mean for Mercedes?

<ul> <li><b>Check Engine Light</b>: The Check Engine Light will illuminate due to the EGR boost sensor circuit fault. This is a direct indication of the P1195 code.</li> <li><b>Poor Engine Performance</b>: The vehicle may experience reduced power and acceleration. This is often caused by the EGR system not functioning correctly due to the sensor circuit fault.</li> <li><b>Increased Emissions</b>: Higher levels of exhaust emissions may be observed. This is because the EGR system is not properly regulating the exhaust gases.</li> <li><b>Rough Idling</b>: The engine may idle roughly or stall. This can be attributed to the improper functioning of the EGR system, affecting the air-fuel mixture.</li> </ul>

<ul><li>The EGR boost sensor may have a faulty connection or damaged wiring, leading to intermittent or no signal.</li><li>The EGR boost sensor itself could be defective, providing incorrect readings to the ECU.</li><li>There might be a blockage or restriction in the EGR system, affecting the sensor's ability to measure boost pressure accurately.</li><li>The ECU could be malfunctioning, misinterpreting the signals from the EGR boost sensor.</li><li>Vacuum leaks in the EGR system can cause incorrect sensor readings, triggering the fault code.</li></ul>

<ul> <li><b>Initial Inspection</b>: Visually inspect the EGR boost sensor and its wiring for any signs of damage, corrosion, or disconnection.</li> <li><b>Check Sensor Voltage</b>: Using a multimeter, measure the voltage at the EGR boost sensor connector. Compare the readings with the manufacturer's specifications.</li> <li><b>Test Sensor Ground</b>: Ensure the sensor has a proper ground connection. Use a multimeter to check for continuity between the sensor ground wire and the vehicle's chassis.</li> <li><b>Inspect EGR Valve</b>: Check the EGR valve for proper operation. Ensure it is not stuck open or closed, which could affect the sensor readings.</li> <li><b>Scan for Additional Codes</b>: Use an OBD-II scanner to check for any other related DTCs that might provide further insight into the issue.</li> <li><b>Check ECM Connections</b>: Inspect the connections to the Engine Control Module (ECM) for any loose or corroded pins that could affect the sensor circuit.</li> <li><b>Replace EGR Boost Sensor</b>: If all previous steps are inconclusive, replace the EGR boost sensor with a new one and clear the DTC code. Re-test to ensure the issue is resolved.</li></ul>

<p>The DTC code P1195 indicates an EGR boost sensor circuit fault in Mercedes vehicles. This issue can lead to improper exhaust gas recirculation, affecting engine performance and emissions.</p><ul><li><b>Immediate Actions:</b> Inspect the EGR boost sensor and its wiring for damage or disconnection.</li><li><b>Potential Risks:</b> Delayed repair can result in increased emissions, reduced fuel efficiency, and potential engine damage.</li></ul>