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2001 Ford Taurus PO401 and PO402 Codes: DPFE Sensor Location, EGR Cleaning, and Fix Options

Model: 2001 Ford Taurus Fault Code: P0401 Posted: 2006-07-06 21:58

Hi everyone, I'm working on my 2001 Ford Taurus with 49,000 miles, a 3.0L engine, and 12V system. The vehicle is showing persistent check engine light codes PO401 (Insufficient Diesel Oxidation Catalyst Efficiency) and PO402 (Excessive Diesel Oxidation Catalyst Efficiency). I've consulted my local Ford dealer, who recommended replacing the DPFE (Differential Pressure Feedback Emission) sensor. However, I'm unsure of its exact location—where is it installed on a 2001 Taurus? I don't have access to official service manuals, but I do have solid mechanical experience. Some forum members suggest cleaning the EGR valve, which is located behind the intake manifold. But where exactly is that valve situated? Also, would replacing spark plugs and cleaning the throttle body help improve performance or resolve these codes? I'm looking for clear, factual guidance on troubleshooting steps, sensor locations, and whether replacing the DPFE sensor will automatically clear the codes after installation. Any insights from experienced owners or mechanics would be greatly appreciated. Thanks, Brian

Related fault codes
P0401P0402
Comments (4)
Anonymous 2006-07-07 13:19

The DPFE sensor is typically a silver metal or black plastic box with two vacuum lines and an electrical connector featuring about three wires. It's located on the intake manifold, usually near the top of the engine. Once you have the new sensor in hand, it should be easy to spot by comparing its size and position. I recommend using an official Ford part for reliability—some parts stores can provide diagrams or photos showing exact placement. The dealer is also able to show this during a service visit. Cleaning the EGR valve is unlikely to help with these specific codes. While cleaning throttle body ports and MAF sensor isn or bad ideas, especially if not done before, it won't resolve the underlying DTCs. If you're replacing the DPFE, ensure it's the correct model for your 2001 Taurus. Check your VIN with a local Ford dealer to see if there’s an active recall related to this sensor—some models have known issues covered under recalls. Good luck and feel free to update us on progress! Jeff

Anonymous 2006-07-07 19:33

Some DPFE sensors in the 2001 Ford Taurus are subject to a manufacturer recall. It's worth having your vehicle’s VIN checked at a local Ford dealership to confirm whether you're covered under any active recall programs related to emissions components.

Anonymous 2006-07-12 18:34

Just an update—I’ve now acquired the new DPFE sensor and plan to install it tomorrow. After replacement, I’m wondering: if the codes disappear after installation, will the check engine light turn off automatically? Or do I need to clear the code manually using my basic code reader? I only have a simple OBD2 scanner, so I’d like to know whether clearing is necessary or if the system resets on its own. Any advice would be helpful. Thanks again for the earlier input—really appreciated! Brian

Anonymous 2006-07-12 22:35

If you have an OBD2 code reader, you can clear the codes directly through it. Alternatively, stores like AutoZone offer free code clearing services. If your scanner doesn’t support this function, simply disconnecting the negative battery terminal for about 10–15 minutes will reset the system and clear stored DTCs. This is a reliable method when no dedicated tool is available.