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Forum: S-Series General 08-18-2022, 07:08 PM
Replies: 22
Views: 2,584
Posted By fdryer
Re: Saturn SL P0401

RH45, search past threads in these forums with P0401 errors. Examples are at the bottom of this page. P0401 is the engine exhaust gas recirculation (EGR) valve not flowing enough recirculated...
Forum: S-Series General 09-04-2017, 07:04 AM
Replies: 22
Views: 2,584
Posted By fdryer
Re: Saturn SL P0401

Nope. Any reset, whether or not a check engine light is on or off, erases all emissions parameters that were learned and memorized. In technical terms, all the emissions readiness monitors are...
Forum: S-Series General 08-25-2017, 07:45 PM
Replies: 22
Views: 2,584
Posted By fdryer
Re: Saturn SL P0401

You have few options left. Either try used egr valves specifically for your model year or buy the OEM one. Others here may have more suggestions.
Forum: S-Series General 08-21-2017, 04:49 PM
Replies: 22
Views: 2,584
Posted By fdryer
Re: Saturn SL P0401

Hackettbr1, the test to determine whether or not the intake and exhaust ports under the egr valve are clear can be done at home. Since the loud exhaust frightened neighbors, you can try this same...
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