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2003 Ford Explorer 4.6L Engine P0405 and P2195 Fault Codes - Rough Idle, Sputtering, Cannot Rev Past 2000 RPM

Model: 03 Explorer 4.6 Fault Code: P0405 Posted: 2016-06-04 14:38

My 2003 Ford Explorer with a 4.6L engine is experiencing severe performance issues: it sputters, bogs down when accelerating, and has a rough idle. I can only maintain speed up to 25 MPH, and the vehicle fails to rev past 2000 RPMs. Diagnostic trouble codes P040

Related fault codes

P0405P2195

Comments (2)

Anonymous 2016-06-04 14:56

The P0405 code indicates a potential circuit issue with the EGR system, not just a faulty component. It's important to avoid replacing parts solely based on diagnostic codes. A circuit fault may be present in the EGR valve or its associated sensors. For more details, refer to OBD-Codes.com: https://www.obd-codes.com/p0405. The P2195 code (O2 sensor stuck lean Bank 1 Sensor 1) is likely caused by a vacuum leak in the EGR system, which affects air-fuel mixture detection.

Anonymous 2016-06-04 15:59

The shop tested both front O2 sensors and found that the vehicle ran fine when both were removed or only the left one was installed. However, as soon as the right-side O2 sensor was reinstalled, performance degraded significantly—this strongly suggests a clogged exhaust converter on the right side of Bank 1.