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Exhaust gas monitor light has come on, no change in performance any possible suggestions would be welcome

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No Power or acceleration but runs smoothly .Plugs,filters and exhaust replaced.Good engine.Brakes not binding.No oil consumption.Feels like a 1K cc engine

When folk say the exhaust has been replaced they usually mean a part of the exhaust has been changed, or two parts or even three but rarely do they mean the whole thing has been changed including the cat.
It is not unusual for a cat to become partially blocked and reduce performance.

A restriction to exhaust gas flow is quite distinctive because engines start and run fairly normally and seem to have nothing wrong whatsoever but performance is poor.

I suggest that is worth looking into...

Apr 28, 2016 | Cars & Trucks

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Only revs up to 3000 rpm changed throttle body didn't help changed fuel filter didn't help no power above 25/30mph need suggestions

Possible restricted/plugged catalytic converter causing exhaust back pressure to be too high. You will need a back pressure test performed to see if this is the problem. You can also remove the front oxygen sensor and try revving the motor to see if the exhaust leak created with the sensor removed will lower the back pressure and allow the engine to rev higher

Aug 22, 2015 | 2004 Chevrolet TrailBlazer

1 Answer

Need to fix my 2007 Dodge Ram 3500 dually,6.7 Cummings diesel, check engine light code P2002

P2002 - Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
Description: The powertrain control module(PCM) monitors the efficiency of the diesel particulate filter for a concern. The efficiency of the filter is determined by the amount of restriction in the filter for a certain exhaust flow rate. The diesel particulate filter is preconditioned for 5,000 km (3,107 miles) before the PCM begins to monitor the level of restriction. The test fails when the measured level of restriction is less than the expected level calculated by the PCM. Possible Causes:
  • Dirty air cleaner element
  • Recent manual or thorough diesel particulate filter regeneration
  • Aftermarket accessories and performance modifications
  • Modified tailpipe
  • Exhaust leaks before or near the diesel particulate filter pressure sensor
  • Leaks in the diesel particulate filter pressure sensor connecting hose
  • Damaged diesel particulate filter
Diagnostic Aids: Check for leaks in the exhaust system. Check for aftermarket exhaust accessories and performance modifications that decrease the exhaust restriction. If a new diesel particulate filter was recently installed, verify the diesel particulate filter parameter reset procedure was carried out.

Feb 18, 2015 | Dodge Cars & Trucks

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I have a 2005 Mitsubishi Lancer estate tha has the engine management light on but doesn't seem to affect drive/performance of car what cud this be as I had diagnostic an they say something to do with the...

Trying to make sense of the question: the diagnosticians seem to be saying there''s an obstruction or leakage or something amiss in the exhaust system, quite likely related to the catalytic coverter(s). The main electrical signal involving exhaust (manifold) and cat and ECU (computer) would be the O2 sensor or heated O2 sensor. A "confused" signal from O2 sensor to ECU could cause it to signal a Check Engine message--perhaps a sluggish O2 sensor. That sensor generally controls EGR (exhaust gas recurculation) fuel return to fuel intake, and could be malfunctioning without obvious performance degradation. Since your "engine management" message seem to be suggesting an emissions control fault, the items referred to above seem like likely candidates as the problem. It should not be ignored even with driver acceptable, nominal engine performance because exhaust gas recirculation (EGR) control is also associated with fuel mixture control...which, if not corrected, shows up as too high nitrogen oxides out the tail pipe; and otherwise as rapid destuction of the expensive catalyitic converter(s).
Depending on how long since last O2 sensor replacement (say, over 5 years to never) DIY changing to that sensor could prove a cheap way to clear the problem. Even if not, you now have an assured sensor without spending too much or more than you will eventually spend anyway. The rest of the problem is generally not owner servicable.

Oct 28, 2014 | Cars & Trucks

2 Answers


Are you getting a check engine light? Have you had it scanned for codes? My guess is a bad vacuum leak.

Sep 24, 2014 | 2005 Hyundai Accent

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I have a 2000 buick regal LS with the 3800 series II engine. My service engine soon light came on and it was coded with a bad egr valve. The car was jerking whenever i went up a hill or tried to pass...

What code ? are a few different ones for EGR valve > Low & high circuit voltage , testing circuits , PCM testing etc.... no code tells you to replace the EGR valve without testing . Your best bet , take it to a qualified repair shop.
DTC P0401 Exhaust Gas Recirculation (EGR) Flow Insufficient
DTC P0403 Exhaust Gas Recirculation (EGR) Solenoid Control Circuit
DTC P0404 Exhaust Gas Recirculation (EGR) Open Position Performance
DTC P0405 Exhaust Gas Recirculation (EGR) Position Sensor Circuit Low Voltage

Feb 12, 2018 | Cars & Trucks

1 Answer

Engine light is on. a diagnostic suggested a possible defective vent solenoid...where is this part located?

First try the gas cap to make sure it is on secure and tight.

Code P0440 indicates a problem with the EVAP vent solenoid, which essentially controls the venting of your gas tank in order to maintain a consistent pressure in the tank. This solenoid is mounted on the back of the chassis cross-member just behind your gas tank.

However, a loose or leaking vent hose that connects to this solenoid can also cause this code to appear.

Code P0446 indicates that the VCM (Vehicle Control Module) received
a failure when it tested the EVAP vent solenoid.
The VCM monitors the performance of the Evaporative Emission (EVAP) system by applying a predetermined level of vacuum to the EVAP system and monitors the vacuum decay rate. The VCM sets this code if the vacuum decay rate is more than a predetermined value.

Again, this could indicate a loose or leaking vent tube.
This solenoid is very easy to test simply by first checking for continuity across the coil, if that's good then applying 12 volts across the two pins on it will cause it to "click" changing the position of the valve.

Mar 22, 2011 | Chevrolet Cavalier Cars & Trucks

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PCM code P0404

P0404 - Exhaust Gas Recirculation (EGR) Open Position Performance
I suspect the EGR got stuck closed, u will need to put around 30 miles on the car before the light will return if the problem is still present..

May 26, 2009 | 1999 Saturn SL

1 Answer

I have an '08 2500 w/ Duramax. My dash diagnostic LED said "change exhaust filter" then "se owners manual" and the engine light came on. There's no info for changing and exhaust filter...

The 08 diesel vehicles have a particulate filter much like a catalytic converter an a gas engine, these exhaust cannot be modified by removing the filter . The PCM will monitor this function and alert you with a service engine light if an issue is detected . Removing this filter will also cause the vehicle to go into a low power mode until the problem is repaired . It is also illegal to remove this filter as it part of your emission system for that vehicle . I don't think your programmer and intake would cause you any issues.

Aug 08, 2008 | 1993 GMC Sierra C2500

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