Question about Oldsmobile Achieva

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I HAVE A CODE#402-401 CHECK ENGINE LIGHT...I BELIEVE ITS PART OF THE EXHAUST SYSTEM?...IF IM WRONG PLEASE ....I NEED HELPPPPPPPPPP

Check engine light is on ....code#402 got something to do with the exhaust system...on a oldsmobile achieva 1997

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I believe it's a egr system code
I got a 406 witch is egr flow sensor A high voltage
I hope that helps your search

Posted on Feb 27, 2010

  • stonya28 Feb 27, 2010

    go to this site for a complete list of codes
    http://www.obd-codes.com/trouble_codes/
    404 is egr curciut range performance


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2 Answers

Check engine light code po401


EGR insufficient flow detected, could be a failing exhaust system creating a blockage,

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Check engine light code p1150


Code 1150 for a Lexus means the O2 sensor for bank two sensor one is not working. It could be a problem with the sensor or the wiring harness. Bank two is on the side of the engine with cylinder two, and sensor one is in front of the catalytic converter.

Oct 12, 2012 | Lexus Cars & Trucks

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I HAVE A 2005 CHRYSLER 300 HEMI AND MY ENGINE LIGHT IS CONSTANTLY ON AND HAS BEEN FOR ABOUT 3 DAYS I ALREADY HAD THE OIL CHANGED THEY SAID I WAS ABOUT 4 QUARTS LOW. WHEN IS MY LIGHT GOING OFF. ITS NOT...


I assume this is the check engine light, it is a picture of an engine and it is yellow. If that is correct please read on, if not let me know.

The information below was complied by me, it explains what causes the check engine light to come on and the process of finding the cause.
When the Check Engine light (or Service Engine Soon or small picture of an engine) is turned on, the systems computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible system faults (the gas cap is just one of them) that turn the Check Engine light on, to know what has developed a problem you must have the electronic system tested, this is called an OBD2 fault code test, Kragen/Oriley and Autozone parts stores (USA only) do this testing for free.

Oct 20, 2011 | 2005 Chrysler 300

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2003 lincoln town car signature series:unfortunately, I have more than one problem though I have been unable to diagnose... This car sat for a long time... catalytic converter on passenge side is...


If the exhaust is clogged, you will have problems. The lite will flash if the system thinks there is a problem that may damage the cat, which you say is already faulty. I'd fix that first.
If you think it is fuel issue, use a gage and check proper fuel pressure.
The basics for problems at higher rpms, check for blockage of some kind, fuel--air--exhaust.

Mar 02, 2017 | Lincoln Town Car Cars & Trucks

1 Answer

Keeps giving P0171 reading any help


P0171- System Too Lean (Bank 1)

The adaptive fuel strategy in the vehicle's computer constantly monitors the fuel delivery system to make sure the engine is running at an optimum air to fuel ratio, which is 14.7:1. The computer adjusts injector pulse width to regulate the amount of fuel going into the engine. The oxygen sensors relay information to the Powertrain Control Module (computer), informing it of the oxygen content in the exhaust. This information is translated by the computer, and used to determine if more or less fuel is needed. The computer will then adjust fuel flow (and possibly other related engine operating characteristics), to keep the correct air fuel mixture. This loop continues as long as the engine is running.

A P0171 check engine light code is set when the computer has reached a rich calibration limit and can not add enough fuel to maintain the correct mixture.

Possible Causes:
The following is an overview of P0171 check engine light code possible causes.

Fuel System:

Leaking or faulty fuel pressure regulator
Plugged or dirty fuel filter or lines
Fuel pump weak or defective check valve
Injectors leaking or faulty
Low fuel pressure or running out of fuel
Leaking EVAP system components
Faulty FRP (Fuel Rail Pressure Sensor)

Air Intake System

Vacuum leaks
Contaminated, damaged or faulty Mass Air Flow sensor
PCV valve leak or stuck open
Air induction turbulance caused by wrong filter
Oil dipstick not seated
Air leaks after the Mass Air Flow Sensor (MAF)
Oil coated aftermarket air filter

Exhaust System

Any exhaust leak before or near the oxygen sensors

EGR System

Vacuum line disconnected from EGR System Module (ESM)
EGR valve, tube or gasket leak
EGR vacuum regulator valve leaking

Secondary Air Injection System

Mechanically stuck secondary air injection valve

Diagnostic Help:
A very thorough discussion of how to approach and repair a P0171 check engine light code can be found here. If you need further assistance let us know. Please be sure to stop back in and visit some of our other very useful site features to lear more about your car's emissions system.

Hope this helps (remember to rate this answer).

Jan 22, 2011 | 2000 Volkswagen Beetle

1 Answer

Vsc & check engine light on. Code reads cylinder 2 misfire I have changed the plugs swaped coil with another cylinder swaped vsv's swaped injector plugs with another cylinder always shows misfire #2...


You may need to look at your exhaust system. If you have a leak, your O2 sensors will send the wrong reading to your engine which will in turn tell your engine to fire differently. Your code will come up reading as a misfired bank. See if you have an exhaust leak first, then see about changing out the O2 sensors behind the leak.

Jun 21, 2010 | Cars & Trucks

1 Answer

Check engine light on, replaced oxygen sensor before catalyst,


  • Water or corrosion in the connector
  • Loose terminals in the connector
  • Wiring burnt on exhaust components
  • Open or short in the wiring due to rubbing on engine components
  • Holes in exhaust allowing unmetered oxygen into exhaust system
  • Unmetered vacuum leak at the engine
  • Bad o2 sensor
  • Bad PCM

Jun 18, 2010 | 1999 Lexus RX 300

1 Answer

What makes a check light comes on


There are to many things to list that will cause the check engine light to come on. Some of the more popular causes are the emission system failures, exhaust, gas, electrical, starter, and so on. You will need to get or find a code reader and have the check engine light code read to know what is the cause of it

Jun 04, 2010 | 1996 Toyota Corolla

1 Answer

Check engine light is on


There are many causes to this problem, but you might need to take it to a shop to find the real problem.
Here's everything I know about it.
P0171 System too Lean (Bank 1)
How does a P0171 code trigger the check engine
light? This code will trigger the check engine light as follows:

The adaptive fuel strategy in the vehicle's computer constantly monitors the fuel delivery system to make sure the engine is running at an optimum air to fuel ratio, which is 14.7:1. The computer adjusts injector pulse width to regulate the amount of fuel going into the engine. The oxygen sensors relay information to the Powertrain Computer Module (computer), informing it of the oxygen content in the exhaust. This information is translated by the computer, and used to determine if more or less fuel is needed. The computer will then adjust fuel flow (and possibly other related engine operating characteristics), to keep the correct air fuel mixture. This loop continues as long as the engine is running.

A P0171 check engine light code is set when the computer has reached a rich calibration limit and can not add enough fuel to maintain the correct mixture.

Possible Causes:
Fuel System:

Leaking or faulty fuel pressure regulator
Plugged or dirty fuel filter or lines
Fuel pump weak or defective check valve
Injectors leaking or faulty
Low fuel pressure or running out of fuel
Leaking EVAP system components
Faulty FRP (Fuel Rail Pressure Sensor)

Air Intake System:

Vacuum leaks
Contaminated, damaged or faulty Mass Air Flow sensor
PCV valve leak or stuck open
Air induction turbulence caused by wrong filter
Oil dipstick not seated
Air leaks after the Mass Air Flow Sensor (MAF)
Oil coated aftermarket air filter
Exhaust System:

Any exhaust leak before or near the oxygen sensors

EGR System

Vacuum line disconnected from EGR System Module (ESM) EGR valve, tube or gasket leak
EGR vacuum regulator valve leaking

Secondary Air Injection System

Mechanically stuck secondary air injection valve

Apr 12, 2009 | 2000 Hyundai Sonata

1 Answer

Check engin light comes on.


The check engine light can come on for many reasons! But being that changing the sensor at the exhaust did help for a while makes me tend to believe there is still a prob in this area. If you do a lot of low speed driving and stop an go, the convertor on the exhaust could be clogged a bit. Esp a lot of short drives. The dealer sounds like a place to stay away from!! Frankster016

Oct 26, 2008 | 2001 Lexus IS 300

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