Chevrolet
Impala
42

Check Engine Light With Code P0171 and/or P0174 on Chevrolet Impala

Problem Description and Possible Solution

The exhaust gas recirculation (EGR) tube which connects the EGR valve to the intake manifold may develop an engine vacuum leak, causing the Check Engine Light to illuminate with code P0171 and/or P0174 stored.

Problem Data
RepairPal Verified
Average mileage: 116,670 (16,580–181,000)
Exhaust & Emissions affected: 3.8L V6
8 model years affected: 2000, 2001, 2002, 2003, more2004, 2005, 2007, 2008
42 people reported this problem
Comments
Viewing 1 - 16 of 16 comments
I have changed the EGR Valve about 3 times and it's still saying The EGR Valve is open
Check engine light came on and nothing happened for awhile. After a few months, the engine started making really loud sounds, like I was revving the engine, when my foot was not on the break or gas pedal. The noise has gotten progressively louder.
Check Engine Light Due to Vacuum Leak in EGR Tube
I hear air hissing when im up under the hood of the car haven't fix problem yet
for a year and half check engine light has been on reading the same code even though it's been repaired
Check engine light on. Vaccum leak
CHECK ENGINE LIGHT COMES ON AND OFF RANDOMLY, HAD IT CHECKED AND IT GAVE THE EGR CODE, NO PROBLEMS WITH THE CAR THOUGH LIGHT NOT ON ISSUE NOT FIXED
Changed egr valve 3 times now because thats what the codes show . Dealership Don Mullon has done a pressure check on vacum leaks. Low coolant light came on also. Now it has 150,000 Still same problem. This time it cost me 689.00 to fix .Replaceing EGR VALVE AGAIN and a coolant light sensor. I just replaced it less than 30 days ago cost me 227.00.
In Connecticut it will not pass emissions to get plates on the vehicle.
changed egr and mass air flow sensor
Had to get EGR valve cleaned. Check engine light was on. Engine would cut off when at stop light. According to mechanic the EGR valve was getting stuck open when it should be closes when Im at a stop. Because it was stuck open, engine was not getting the right air/fuel mixture cause it too shut down
po171banke1system\check\engine\i\dont\know\if]the\02sense\need\be\change\orthe\air\filter
same problem. EGR valve bad. Had to replace 2 times before was fixed
Only drove about 2 miles. Once I got a half mile from my destination out of no where, I notice at a stop light my engine was putting. It was running like complete cramp so I left it over night at the place I was headed to. Took it to am engine repair. Guy said my #2 cylinder is misfiring and something with my fuel egr.
Egr tube leaking at manifold. If I spray carb cleaner where it bolts to intake engine speed up. Also gave code p0171. Drove me crazy.
Ticking noise haven'tfixed yet thought it was crossover pipe.
Car don't want to take gas want go over 40 mph! Don't know what to do! And my indicater also say low engine power