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P0172 Fault Diagnosis for 2005 Saturn Vue 2.2L 4-Cylinder: Sputtering on Highway, No Black Smoke

Model: Saturn Vue Fault Code: P0172 Posted: 2010-03-03 09:19

Hello everyone! I've read numerous posts about the P0172 code, but none match my exact symptoms. I own a 2005 Saturn Vue with a 2.2L 4-cylinder engine. The issue began when driving on highways after 20–30 minutes of operation — the car starts to sputter, feeling like it's choking or coughing. I can still accelerate, but it’s very frustrating. The sputtering only occurs when accelerating; once I release the gas and coast, the problem stops completely. As soon as I press the accelerator again, the sputtering returns. However, once I exit the highway and reduce engine RPM to lower speeds, everything runs smoothly. My car has never stalled, and idle is perfect — it sits comfortably at 700–800 RPM, almost like it's not running at all. I’ve seen no black smoke, especially now that it’s warming up outside. The P0172 code persists constantly, and I’m finding dealerships too expensive to visit right now. So, where should I begin? What diagnostic tests or checks can I perform to identify the root cause? Thanks in advance for any advice!

Related fault codes
P0172
Comments (4)
Anonymous 2010-03-03 11:27

I recommend checking the oxygen sensors or inspecting the fuel pressure regulator for leaks. Without detailed diagnostic data, this could be a guesswork situation — proper diagnosis is essential before replacing parts.

Anonymous 2010-03-03 11:37

When I visited the dealer, they only mentioned the P0172 code during a highway test. They didn’t provide any additional details. They checked the EVAP system (normal), inspected all hoses — nothing appeared faulty. We also replaced the ICM, coil pack, spark plugs, and gas cap. None of these fixes helped. I’ll be going to a more affordable garage soon — but what should I specifically ask them to check first?

Anonymous 2010-03-04 06:09

Don’t just ask for checks — describe your symptoms clearly, list all parts that have already been replaced, and explain the history. If the dealer only checked the EVAP system without deeper diagnostics, it’s likely they didn’t fully investigate. A P0172 code often requires more than a simple scan — it may need time for freeze frame data analysis, sensor testing, or fuel system checks. How much time did you allow them to spend? If not enough, the issue might have been missed. Avoid choosing cheaper shops just because they’re less expensive — in diagnostics, quality and experience matter far more than price. A competent technician will know what to test without being told.

Anonymous 2012-06-30 04:17

I replaced my catalytic converter for $350 and the oxygen sensor for $75 — after that, the P0172 code disappeared and the car runs smoothly again.