You have to jack the car up, put it on jack stands crawl under. The EGR will be near the fire wall and very hard to reach. It's close the rear motor mount. It is situated next to the rear exhaust manifold on the block, the side closer to the driver. Hope that helps. visit mx6.com for more help
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Year/make/model??? Applying vacuum to the EGR and making the valve open will not be the correction. Once opened, this valve allows unburned exhaust gas back into the combustion chamber resulting in a rich mixture. The computer sees this rich mixture and reduces the injector pulse allowing the idle to slightly lower. If the vehicle were at proper idle speed and this valve is opened, it would run rough snd possibly stall
Here is an overview for the code as it relates to Toyota cars.
I would go back and make sure the tubes and pipes are clear.
In most cases, the passage is plugged up, or the sensor does not "see" the flow.
- EGR passage clogged
- Faulty EGR Vacuum Modulator Valve
- Faulty EGR Valve
- Faulty EGR solenoid valve
- EGR solenoid valve harness is open or shorted
- EGR solenoid valve circuit poor electrical connection
- Dead (Weak) battery
- Faulty EGR temperature sensor and circuit
- Exhaust gas leaks
oh yes i know its you EGR valve (Exhaust Gas Recalculation)
A code P0401 most
likely means one or more of the following has happened:
The DPFE (differential pressure feedback EGR) sensor is faulty and
needs to be replaced
There is a blockage in the EGR (tube), most likely carbon buildup
The EGR valve is faulty
The EGR valve may not be opening due to a lack of vaccuum
In fixing this code, it is quite common for people to just replace the
EGR valve only to have the OBD code return. The EGR valve is not always
Use a vacuum pump and pull the EGR valve open while monitoring
engine RPM's & DPFE voltage. There should be a noticable difference
in RPM's with the EGR open
Clean out the EGR valve and/or tubing to remove deposits
Check the voltage at the DPFE, compare to specified values (refer to
a repair manual for your specific model)
Replace the DPFE sensor (with a good quality / OEM one)
Replace the EGR valve
Related EGR Articles: P0400 - P0402 - P0403 - EGR System Explained
P0401 - Exhaust Gas Recirculation Flow Insufficient Detected
- Harness or connectors (EGR volume control valve circuit is open or shorted.) - EGR volume control valve stuck closed - EGR volume control solenoid valve - Dead (Weak) battery - EGR passage clogged - Exhaust gas leaks
- Clean EGR Valve - Repair EGR harness or connector - Replaced EGR volume control solenoid valve - Replaced EGR volume control valve
DTC P1406 IS EGR VALVE PINTLE POSITION CIRCUIT MALFUNCTION CONDITIONS.POSSIBLE CAUSE EGR SOLENOID CONTROL CIRCUIT IS OPEN SHORTED TO GROUND OR TO B+ -CHECK EGR VALVE FUSE - OR THE EGR VALVE AND PCM HAS FAILED.
If it's a 2.0L, 5 speed (1994-7) there are two DPFE solenoids (both w/ 3 vacuum ports) near the oil filter, which control the EGR valve. They are discontinued and impossible to find except on junked cars. (FORD #'s K5T44093-4) I have to junk my 1996 Probe if I don't find them - Missouri emissions.
Hi, The EGR valve itself is on a set of flexible pipework - usually stainless steel - which runs between the inlet manifold and the exhaust manifold. The EGR actuator valve is pneumatically / vacuum operated by a solenoid valve, controlled by the ECU ( aka the brane). It's not usual for the EGR valve itself to fail, more likely the solenoid valve or its electrical connector getting dirty. If you google for VAG TDI N75 valve you should get all the info you could possibly ever need :-)