Question about 2004 Chevrolet Aveo

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04 aveo has codes PO300 and PO 401 i have changed egr valve and bothb 02 sensors and still get same codes less the 02 code plugs and wires are good still runs sluggest what do i try next?

Posted by on

1 Answer

You don't try anything

The Codes you get are sensors reporting
an out of range condition.
That means you find out why,not change them

The 300 is a misfire issue

I suggest as much as i like to see you
do all your own work,that you go to a repair
shop, that know the technolgy ,and you will not
have any of the test equip needed to solve much
of anything on todays vehicles

Posted on Mar 15, 2011

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00 Camry 2.2 egr problem po 401 low flow new egr valve new solenoid new transducer new map clean passages. I don't know what else to do


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

Sep 05, 2014 | Cars & Trucks

1 Answer

Misfire po300


Error Code: P0300
Description:
Random/Multiple Cylinder(s) - Misfire Detected
Problem Area:
Air Intake System leaking.
Fuel Supply faulty.
Injector(s) faulty.
Ignition Cable(s) and/or Spark Plug(s) faulty.
Ignition coil(s).Exhaust Gas Recirculation (EGR) Valve stuck/open.
Camshaft Position Sensor faulty.
Low compression.
Wiring.

Solutions:
Check Misfire Recognition.
Check Air Intake System.
Check Fuel Supply.
Check Injector(s) and Injector Sealing.
Check Ignition Cable(s) and Spark Plug(s).
Check Ignition Coil(s).
Check Exhaust Gas Recirculation (EGR) Valve .
Check Camshaft Position Sensor.

Feb 25, 2014 | Chevrolet Cobalt Cars & Trucks

1 Answer

I have 2 codes PO 300 and PO 420


po300 is a random misfire code(could be egr passages blocked under upper pleinum;plug wires;plugs or coils.PO420 is catalatic converter below threshold(converter has to be replaced)

Jan 02, 2014 | 2001 Pontiac Grand Am SE

1 Answer

2001 Isuzu Rodeo 4 cylinder Check Engine Light


Normally a shop would use a scanner to watch the operation of the EGR valve and sensor.
Code 401 means the sensor is telling the computer the flow is not enough. So the problem could be the sensor rather than the EGR valve. And yes one of the ports could be blocked too.

Jun 28, 2013 | 2001 Isuzu Rodeo

1 Answer

Po 401


the EGR can be stuck wide open causing the code.

Mar 17, 2013 | 1997 Cadillac Seville

2 Answers

Considering buying 1993 Mazda 929 3.0L Automatic. Have diagnostics report with list of 2-digit numbers representing results of diagnostic engine performance computer codes. How do I find out what these...


Hello! Here is a list of Trouble codes for a 1993 Mazda...I would strongly suggest that you not purchase the vehicle...A long serious list...Looks like a faulty Electronic Control Module (ECM)...

Guru..........Saailer




02 Crank Position Sensor 2 (NE 2 Signal). 03 Crank Position Sensor 1 (G Signal). 04 Crank Position Sensor 1 (NE 1 Signal). 05 Knock Sensor. 08 Air Flow Sensor. 09 Engine Coolant Temperature Sensor. 10 Intake Air Temp. Sensor (Air Flow Sensor). 12 Throttle Position Sensor. 14 Barometric Absolute Press. Sensor. 15
and/or
23 Heated Oxygen Sensor (Inactivation). 16 EGR Function Sensor. 17
and/or
24 Closed Loop System. 25 Pressure Regulator Control Solenoid Valve. 26 Purge Control Solenoid Valve. 28 EGR Vacuum Solenoid Valve. 29 EGR Vent Solenoid Valve. 34 Idle Air Control Valve. 41 VRIS 1 Solenoid Valve. 46 VRIS 2 Solenoid Valve. 67 Coolant Fan Relay No. 1. 69 Engine Coolant Temperature Sensor (Fan). To Extract DTCs:
  1. Warm engine to operating temperature and turn ignition "OFF."
  2. Install jumper wire between TEN and GND terminals of data link connector.
  3. Turn the ignition switch to the ON position.
  4. If MIL illuminates for 3 seconds, goes off, and stays off, no codes are present.
  5. If MIL illuminates, then starts flashing, record codes.
  6. When all codes have been recorded, remove jumper wire.
mazda_test_conn-a.gif

Jan 27, 2011 | 1993 Mazda 929

2 Answers

I have a OBD II Trouble Code PO401


PO-401
EGR Flow Insufficient Detected

May 15, 2010 | 1999 Chevrolet Lumina

2 Answers

Ok I?m getting a p1297 code and then I?ll start getting po301 If I erase the codes then start the car and let it idle ill get the po300 po301 po302 po303 Then drive the car ill get the p1297 If I erase...


Clean the EGR valve seat. The EGR may have become stuck. A good way to check for vacuum leaks is to use smoke near every intake vacuun hose . And near the intake manifold. The valve will **** in the smoke. If you clean the EGR valve and it still misses. Replace it. The EGR can cause random misfire.

Jan 06, 2010 | 2001 Volkswagen Beetle

1 Answer

Every now and then the car wants to stall but it does not


You have verified the EGR valve will operate when vacuum is applied so the valve and chambers are good..correct? If thats the case, then
your issue here is the VSV (vaccum switching vavle), these intermittently get stuck. Follow the vaccum lines down behund the intake, you will find the vsv located on the back side of the block just above where the drive axle mounts to the block.
Replace this VSV and the modulator valve at the same time, they tend to fail togather.
Good luck, i hope this helps...please rate me a fixya

Jul 31, 2009 | Toyota Camry Cars & Trucks

1 Answer

I just bought a 1997 Mercury Sable it was a private sale. Once I got it home the check engine light was on can't remember the code but it when I looked it up it was the canister purge valve. Spent $80. for...


P0401 insufficient EGR flow.

Possible causes:
  • Fault in vacuum supply to EGR vacuum regulator solenoid.
  • EGR valve stuck closed or iced.
  • EGR valve diaphragm leaks.
  • EGR valve or flow path restricted.
  • EGR vacuum hose off, plugged or leaks.
  • VPWR circuit open to EGR Vacuum Regulator solenoid.
  • EVR circuit to PCM open.
  • EVR circuit to PCM shorted to PWR.
  • Differential Pressure Feedback EGR (D.P.F. EGR) sensor pressure hoses both connected improperly.
  • D.P.F. EGR sensor pressure hoses reversed.
  • D.P.F. EGR sensor VREF circuit open.
  • Downstream pressure hose off.
  • Downstream pressure hose plugged.
  • Damaged orifice tube assembly.
  • Damaged EGR Vacuum Regulator solenoid.
  • Damaged D.P.F. EGR sensor.
  • Damaged PCM.



P0443 indicates an intermittent EVAP canister purge valve circuit failure.
Possible causes:
  • Intermittent EVAP canister purge valve or VPWR circuit open.
  • Damaged EVAP canister purge valve.

Mar 13, 2009 | 1997 Mercury Sable

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