Question about 2003 Chevrolet Impala

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Trouble shooting code P0404 comes up and EGR VALVE, FUEL FILTER, SPARK PLUGS AND WIRES have been replaced. Is there an EGR sensor? What else could it be?

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Posted on Jan 29, 2011

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S class not starting


do tune up replace spark plugs and wires.replace fuel filter.to trouble shoot engine not starting check for fuel or spark.if see no spark at spark plugs you could have faulty ignition coil or crankshaft position sensor faulty. could have faulty ECM.no fuel problem could be faulty fuel pump relay or pump failure code scan vechicle first before buying new parts.if all is good timing chain slipped time or broken.

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2.2 litre 1995 gmc sonoma idles rough no trouble code. found hole i brake booster vaccum line fixed that. replaced and changed fuel filter, idle air control valve, got spark at coil packs, put new spark...


Three things you should check using a good code checker which can read sensor outputs - the throttle position sensor (TPS), the mass air flow sensor (MAF) and the EGR valve. While you are at it, replace the PCV valve.

Jul 30, 2017 | 1993 GMC Sonoma Club

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My 02 grand am gt is acting up engine light is on went to autoparts store to get it checked out it threw codes p1404, p0404 and p0300 i already changed the egr valve twice and it wont help can someone plz...


code p0404 refers to Exhaust gas recirculation system (EGR)--range performance problem--- causes---hose leakage--wiring---EGR valve/solenoid
code p0300 refers to random/multiple cylinder/s ---misfire detected.---causes---spark plugs---ht leads---injectors--ignition coils---low compression ---wiring. Remember it is best to use genuine sensors/solenoids as the cpu is set to them. Try changing the egr solenoid

PLEASE RATE THIS REPLY FOR ACCURACY

Mar 24, 2013 | 2000 Pontiac Grand Am GT

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My truck keeps dying even when driving down the road


SOUND LIKE IDLE AIR CONTROL VALVE BAD MASS AIR FLOW SENSOR.CAUSE ENGINE STALL OUT.MAKE SURE SPARK PLUGS AND WIRES OKAY.REPLACE FUEL FILTER SEE IF IT HELPS.IF NO CHECK FUEL PUMP PRESSURE AND PUMP RELAY.CODE SCAN FOR OTHER PROBLEMS LIKE FAULTY EGR VALVE.

Sep 20, 2011 | Chevrolet 1500 Cars & Trucks

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Egr valve for 1997 cheve Blazer code is 0300 misfireing what could be the trouble


usually this code is followed by another number 1-4 or 1-6 or 1-8 depending on how many cylinders your vehicle has ,, what the code you got is a basic P0300 Random/Multiple Cylinder Misfire Detected A code P0300 may mean that one or more of the following has happened:
  • Faulty spark plugs or wires
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector(s)
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Stuck/blocked EGR valve / passages
  • Faulty camshaft position sensor
  • Defective computer
  • I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
    Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck ope

Jun 23, 2011 | 1997 Chevrolet Blazer

1 Answer

Getting a PO300 code, have replaced the crank, MAP sensors, fuel pump and filter and replaced Coil #3 /new Plugs, i am running out of options. Been like this for two weeks and I need a vechile for work.


P0300 Random/Multiple Cylinder Misfire Detected, if your doing the cylinder number 3 the code should have read PO303,, either way, these are some of what needs to be checked A code P0300 may mean that one or more of the following has happened:
  • Faulty spark plugs or wires
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector(s)
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Stuck/blocked EGR valve / passages
  • Faulty camshaft position sensor
  • Defective computer
  • If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
    Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Jun 17, 2011 | Chevrolet TrailBlazer EXT Cars & Trucks

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My 99 alero will start but will not stay started. I replaced my fuel pump,,the filter, the crank sensor,,the mass air flow sensor and it still wouldn't stay started. Please tell me whats wrong.


BAD SPARK PLUGS AND WIRES,INTAKE MANIFOLD VACUUM LEAK.STUCK OPEN EGR VALVE OR FAULTY IDLE AIR CONTROL VALVE.HAVE VECHICLE SCANNED FOR IDLE SPEED CONTROL FAULT CODE, FAULTY EGR VALVE FAULT CODE, AND BAD FUEL INJECTOR.REASON I SAY SCAN VECHICLE FIRST BECAUSE EVERYTHING COULD BE GOOD AND YOU COULD BAD GASOLINE CONTAMINATED WITH WATER.BUY A LOT OF NEW PARTS WILL ADD UP.

Dec 15, 2010 | 1999 Oldsmobile Alero

1 Answer

1998 Chevy Truck 1/2 ton 350 engine. Trouble codes P0404, P0405 and P1404. I replaced the EGR valve. Now I get t/c P0404 and P0405. Now what should I check?


404 is exhaust gas recirculation circuit, and 405 is exhaust gas recirculation sensor circuit low. EGR sensor or ground?

Nov 13, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Rough Idle trough1500 RPM with trouble


A code P0303 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer
Possible Solutions If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

A. P0401 "Exhaust Gas Recirculation Flow Insufficient Detected" that there is not enough exhaust gas being admitted to the engine.
There are a number of things you can check, and others you need a scan tool to check.
What you can do is check for vacuum to the EGR valve. You can remove the EGR valve and see if it is stuck closed. Test it with a hand vacuum pump and see if it opens smoothly. Check the EGR valve orifice and make sure it is free and clear. Check and clean the EGR passages in the going to and from the EGR valve.
If this checks out, then the Differential Pressure Feedback EGR system will need to be scanned to check the EGR sensors and switches

A code P0301 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer

Oct 11, 2009 | 1999 Ford Taurus

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