Question about 1999 Mazda Protege

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Check engine light 1999 Mazda Protoge 1.6l engine

I get 0402 code excessive gas flow in EGR. Replacement vavle runs about $250. can the old one be cleaned? If so, what do you recommend?



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Read this article, it explains that you have plugged EGR gas passages, the valve is not the problem, but read the link.

Posted on May 14, 2009


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Posted on Jan 02, 2017


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1 Answer

I have a 0402 fault code on my 16 hid xsara what does that mean?

OBD II Fault Code
  • OBD II P0402
Fault Code Definition
  • Excessive EGR Flow
  • Check Engine Light will illuminate
  • In most cases, there are no adverse conditions noticed by the driver
  • In some cases, there may be performance problems, such as dying at stop signs or rough idling, hesitation, misfires or lack of power (especially during acceleration), and a decrease in fuel economy
Common Problems That Trigger the P0402 Code
  • Excessive Vacuum signal or Electrical signal to the EGR Valve
  • The EGR Valve is defective and is opening too far or not properly closing
  • Lack of proper EGR system feedback to the computer from the:
    • Manifold Absolute Pressure Sensor (MAP)
    • EGR Temperature Sensor
Common Misdiagnoses
  • Ignition System
  • Fuel System
  • Oxygen Sensor
  • EGR Valve

Oct 31, 2016 | Cars & Trucks

1 Answer

1998 Mazda Protoge 1.5 L Codes P0120, P0505

It's possible that the EGR passageway is plugged up with carbon, which may facilitate the need to pull the intake off to get it cleaned out properly...You might be able to see if you can run piece of wire into the EGR passageway. TPS and IAC codes could be simply due to them being out of range due to the clogged EGR passage.

Jan 13, 2014 | Mazda Protege Cars & Trucks

4 Answers

Grand carvan gives p402 code

This is not a cut and dry fault code. This means that more than one thing wrong can set the code in the computers memory. Here is the low down on the P0402 fault code. This is from the OBD2 fault code diagnostic book.

P0402 - Exhaust Gas Recirculation Flow Excessive Detected
Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Possible engine hesitation
Possible causes - EGR solenoid valve harness is open or shorted
- EGR solenoid valve circuit poor electrical connection
- EGR volume control valve stuck closed
- Dead (Weak) battery
- Faulty EGR temperature sensor and circuit
- Faulty EGR Valve
- EGR passage clogged
- Exhaust gas leaks

Jan 18, 2012 | Cars & Trucks

1 Answer

Need to find out were the dpfe sensor is on my 1999 toyota camery with a v6 it has a code po402 and they say to check this sensor first

p0402 is egr valve flow excessive. egr valve needs cleaned or replaced also check wires etc. to vavle.

Apr 22, 2011 | 1999 Toyota Camry

1 Answer

1999 plynouth grand voyager was coding egr replace

just because the check engine light is back on, it doesn't necessarily mean it is for the same problem. it could be, but would need to pull codes again to find out what its for. literally hundreds of different codes could turn on check engine light. also, was original code for "insufficient egr flow" or "excessive egr flow"? it makes a difference.

Feb 21, 2010 | 1999 Plymouth Grand Voyager

2 Answers


P0402 egr Flow Excessive at Idle.

look for a vacuum line, but the egr is an electric multistage step motor. Sometimes you can remove them and clean the prindle area. I recommend that first because they are not a cheap part. You might be able to get one from a pick and pay. They are pretty easy to replace if you need to.

Hope this helps.

Jan 02, 2010 | 1996 Pontiac Sunfire

1 Answer

For my 1996 Mazda Protoge, where/how do I set/increase my idle speed?

have your egr checked or cleaned also run a diagnostic from autozone or some place like checkers they sometimes can run a free diagnostic code check it will show you where your problem lies i have had the same problem with my 96 protege cleaned egr valve and runs great

Sep 12, 2009 | 1996 Mazda Protege

2 Answers

Engine light on mazda tribute 2002

Have it checked again and see what code it is. if it is P0401 it is probably the sensor shown below, The DPFE (Diferential Pressure Sensor)sensor is usually mounted on the engine and is connected to the pipe that runs from the exhaust manifold to the EGR valve with two rubber hoses. When the sensor goes bad, the Check Engine light comes on and typically sets any or all of teh following fault codes: P0171 & P0174 (lean codes), and/or P0401 (insufficient EGR flow). Nine out of ten times, the fault is not a bad EGR valve or a vacuum leak, but a bad DPFE sensor. A replacement costs about $112 at Ford, or about $48 at an aftermarket auto parts store.I hope this helps.

Nov 08, 2008 | 2004 Mazda Tribute

1 Answer


I have a 1999 Protege 1.6L with 93,000 miles. And a
1996 1.5L with 170,000 miles.
When my light came on, I got the EGR code read out at Advance Auto ($0). I googled 'Mazda EGR' and found this is frequently due to carbon buildup in the throttle body. It seems the carbon restricts the flow from the EGR, which then calls for a more open valve, and the error code is "excessive flow". Go figure.

Very easy to disassemble throttle body (just check to see where the EGR line is attached to the intake air path, just prior to injector assembly). Sure enough, a clump of carbon around the EGR port in the throttle body. Cleaned it up with a paper clip, Q-tip, and carburetor cleaner. Total cost < $3.
Cleared to code. No light on now, car runs fine.
If your "EGR VALVE" is bad,
you can get one cheap at the url below, and they take Pay-Pal.
Then you can install it of have it installed.

A less expensive fix is to replace the engine Coolant/Antifreeze "Temp Senser"
This will cut fuel to the injectors if not working properly.
Also replace the engine coolant "Thermostat",
when changing "Temp Senser".
You can pick up both at Auto-Zone for about $35.00.
This fixed our 1996 model. The 1999 model was fixed by replacing the
EGR Valve.

Hope this helps.
"Catch me on the flip"

Jul 22, 2008 | Mazda Protege Cars & Trucks

1 Answer

2000 mazda miata r&r throttle body

se if egr is controled by vacium or electric
if it is by vacium then locate the egr solenoide and make sure it has vacium in one hose w/ engine runing if it does then replace solenoide

May 31, 2008 | 2000 Mazda MX-5 Miata

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