Please Help... p0404 and p0137 Error Codes (1999 Saturn SL1)

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P1404 Code - What Does It Mean & How To Fix It

OBD2PROS https://obd2pros.com > Complete List of OBD2...
A P1404 code is not considered serious. The vehicle will run, but with decreased performance however, you should have it looked at right away. If the vehicle is ...

‎Meaning · ‎Common mistakes

P0404 OBD-II Trouble Code: Exhaust Gas Recirculation ...

YourMechanic https://www.yourmechanic.com > Articles
P0404 is a diagnostic trouble code (DTC) for "Exhaust Gas Recirculation Circuit Range/Performance". This can happen for multiple reasons and a mechanic ...

Error Code P0137: Oxygen Sensor Circuit Low Voltage B1S2

AutoZone https://www.autozone.com > diagnostic-trouble-codes
Specifically, the diagnostic trouble code P0137 yields the following message: "O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)." Here's what that means: Your ...

‎What Does the Code P0137... · ‎What Are the Symptoms of a...

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P0401 usually means for most vehicles
Exhaust Gas Recirculation Flow Insufficient Detected

P0404 usually means for most vehicles
Exhaust Gas Recirculation Circuit Range/Performance

P0401 Exhaust Gas Recirculation Flow Insufficient Detected

P0404 Exhaust Gas Recirculation Circuit Range/Performance

Error Code: P0404
Fault Location:
Exhaust Gas Recirculation (EGR) System - Range/Performance Problem
Causes:
-Hose leak/blockage.
-Wiring harness.
-Exhaust gas recirculation (EGR) valve/solenoid.
Error Code: P0473
Discription:
Exhaust Gas Pressure Sensor - High Input
Causes:
- Wiring short to positive.
- Exhaust gas pressure sensor (G450).
- Engine control module (ECM).
Error Code: P0674
Description:
Glow Plug Cylinder 4 Circuit - Circuit Malfunction
Causes:
-No Pre-Glow Period.
-Poor Cold Starting.
-Glow Plug Wiring faulty.
-Poor connection.
-Relay.
-Glow plug control module.
-Glow Plug faulty.
-Engine control module (ECM).
Solutions:
Check Glow Plug Wiring.
Check Glow Plug.
Error Code: P0675
Description:
Glow Plug Cylinder 5 Circuit - Circuit Malfunction
Causes:
-No Pre-Glow Period.
-Poor Cold Starting.
-Glow Plug Wiring faulty.
-Poor connection.
-Relay.
-Glow plug control module.
-Glow Plug faulty.
-Engine control module (ECM).
Solutions:
-Check Glow Plug Wiring.
-Check Glow Plug.

P0404 Exhaust Gas Recirculation Circuit Range/Performance
P0502 Vehicle Speed Sensor Low Input
P0440 Evaporative Emission Control System Malfunction
hope that helps /a little beyond my expertise but theres your codes your looking for ;)

The code definition is "Exhaust gas recirculation control circuit range/performance" found a forum online that may have some helpful info for you http://forum.chryslerminivan.net/showthread.php?t=8397

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

P0404 Exhaust Gas Recirculation Circuit Range/Performance
P0405 Exhaust Gas Recirculation Sensor A Circuit Low
I would check out the sensors on the EGR line.
A chilton manual at the auto parts store should show you how to test the sensors along with the test values. It should run about $20

hey if you truely think it is your egr valve unhook it and if that is the problem then when it is unhooked it should run better and the codes should not come up. hey if you cahnged the 1 o2 sensor and not the other you probably made the code for the one u repalced come up again. i would recommened that you change both of the o2 sensors at the same time. try checking if your catalatic convert is plugged. how you do this is take a dollar bill and hold it at the end of your tail pipe while it is idleing and if the dollar bill stays still you have a plugged catalatic converter.

P0404 Exhaust Gas Recirculation Control Circuit Range/Performance
P0405 Exhaust Gas Recirculation Sensor “A” Circuit Low


It sounds like you have a failure of the EGR valve.