Blocked Passage on ERG System, or Failed ERG Valve, or ERG solenoid Faulty

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.

Possible causes
- 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


Read more: http://engine-codes.com/p0401

P2106 THROTTLE ACTUATOR CONTROL SYSTEM,-PO401-EGR INSUFFICIENT FLOW

That is not an ABS system code, it is a powertrain fault code.P0411 - Secondary Air Injection System Incorrect Flow Detected, most common cause is a failed electric motor in the air injection pump.
The pump is under the hood.
Other Possible causes- Faulty Vacuum hoses damaged
- Air bypass solenoid harness is open or shorted
- Air bypass solenoid circuit poor electrical connection
- Air bypass solenoid leaking/blocked or stuck open/closed
- Air diverter valve leaking/blocked or stuck open/closed

well I'm a mechanic and you just told me what's wrong....
now all you have to do to fix it is test all parts listed replace the one (s) that fail test....

All that Failed EGR valve, EGR solenoid faulty, Failed EGR pressure sensor and failed EGR vposition sensor may be telling you that is the EGR valve is faulty and not that it is loaded up with carbon. But I know you don't want to hear that as that EGR cost more than a can of carb clean and I don't blame ya!

If yoy have a multi meter, check out easyautodiagnostics.com, go to the GM section for your motor, chose test EGR and there should be an explanation on how to run some test on your EGR before you buy a new one.

It's usually the pressure sensor. They get contaminated and give faulty readings.

CHECK VTEC SWITCH OIL PRESSURE.SHOULD BE 50 PSI @3000 RPM FOR THE S2000 OIL PRESSURE SHOULD BE 85 PSI @ 3000 RPM. IF OIL PRESSURE OKAY HAVE TO BE EITHER VTEC SWITCH FAULTY OR VTEC SOLENOID HAS FAILED.SOME TIMES PCM HAS FAILED TO THAT CONTROL CIRCUIT.

well you could remove it and put a hose on it and either **** on it or hook it up to a vacuum and see if it moves up and down, if it don't move it has a bad diaphram

make sure you check the whole egr system,including,egr solenoid,egr feedback sensor,evp,all of them have to be allowing sufficient flow,just replacing the egr might not correct.also check and clean the isc sensor could be faulty or dirty,that controls your stable idle.









TIM.......

PO401 code means that:
The PCM has determined that there is insufficient flow in the exhaust gas recirculation system. Definition: EGR system fault (Exhaust Gas Recirculation) Probable Causes: a. Blocked passage on EGR system b. Failed EGR Valve c. EGR solenoid faulty d. Failed EGR pressure sensor where applicable e. Failed EGR position sensor where applicable