Question about 2001 Mercury Sable
I recently did a tune up on my 2001 sable 3.0l v6 after it was dant the check engine light came on giving 0401 code. could it be that i forgot to renove the negetive battery terminal before changing the plugs and wires?
You have a PO 401 OBD2 Code
Google the code to see what it is & diagnose
the EGR System
There is no need to ever remove battery cables unless the
work you have to do would be safer doing so
Battery Cables & codes are not joined somehow
AFTER you diagnose a problem & AFTER to make the
required repairs & are sure your done,then you can clear ALL data
& road test until 7 of the 8 I/M Monitors run,leaving only the evap
to run days later.
Any time you remove a battery cable, you better know what will happen, or what features you will loose, or are not familiar with how
to restore them
Always use a code reader or scanner to clear DATA,your not clearing codes, your getting rid of valuable data only avail with
Ask yourself !
The key is off
How would changing plugs & wires be an issue?
How would the PCM know you worked on your car?
Posted on Mar 19, 2014
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Posted on Jan 02, 2017
SOURCE: Check engine light with codes
P0171 & P0174 indicate Lean burning on banks 1 and 2. The most common cause is a dirty or defective MAF (Mass Air Flow) sensor. Other causes are bad fuel filters or a broken vacuum line.
Posted on Jul 06, 2011
SOURCE: 1999 mercury sable engine code
In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open.
Clean out the EGR valve and/or tubing to remove deposits.
Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model).
Replace the DPFE sensor (with a good quality / OEM one).
Replace the EGR valve.
Posted on Jul 08, 2011
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