P0402 Code: Exhaust Gas Recirculation \u201cA\u201d Flow Excessive Detected \u2014 Causes, Symptoms, and Fixes - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn what the P0402 code means, what causes excessive EGR flow, common symptoms, how serious it is, and how to diagnose and fix it.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.carparts.com\/blog\/p0402-exhaust-gas-recirculation-a-flow-excessive-detected\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0402 Code: Exhaust Gas Recirculation \u201cA\u201d Flow Excessive Detected \u2014 Causes, Symptoms, and Fixes - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Learn what the P0402 code means, what causes excessive EGR flow, common symptoms, how serious it is, and how to diagnose and fix it.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/p0402-exhaust-gas-recirculation-a-flow-excessive-detected\/\" \/>\n<meta property=\"og:site_name\" content=\"In The Garage with CarParts.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:published_time\" content=\"2021-12-01T08:08:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-12T02:35:19+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/EGR-valve-image-1.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"1001\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"CarParts.com Research Team, Richard McCuistian, ASE Certified Master Automobile Technician\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@https:\/\/twitter.com\/CarPartscom\" \/>\n<meta name=\"twitter:site\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"CarParts.com Research Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0402-exhaust-gas-recirculation-a-flow-excessive-detected\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/p0402-exhaust-gas-recirculation-a-flow-excessive-detected\\\/\"},\"author\":[{\"@type\":\"Person\",\"$id\":\"1651\",\"name\":\"CarParts.com Research Team\",\"jobTitle\":\"Expert Automotive Writer\",\"description\":\"The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. 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When the PCM detects excessive EGR flow, it illuminates the check engine light and stores the code.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.carparts.com\/blog\/p0402-exhaust-gas-recirculation-a-flow-excessive-detected\/#faq-question-1768451090200","position":4,"url":"https:\/\/www.carparts.com\/blog\/p0402-exhaust-gas-recirculation-a-flow-excessive-detected\/#faq-question-1768451090200","name":"Can a bad EGR valve cause P0402?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Yes. A failing or sticking EGR valve is one of the possible causes of excessive EGR flow.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.carparts.com\/blog\/p0402-exhaust-gas-recirculation-a-flow-excessive-detected\/#faq-question-1768451163961","position":5,"url":"https:\/\/www.carparts.com\/blog\/p0402-exhaust-gas-recirculation-a-flow-excessive-detected\/#faq-question-1768451163961","name":"Is P0402 common in certain vehicles?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"The code is often seen in vehicles that use a DPFE sensor to monitor EGR flow, including many Ford models","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.carparts.com\/blog\/p0402-exhaust-gas-recirculation-a-flow-excessive-detected\/#faq-question-1768451165240","position":6,"url":"https:\/\/www.carparts.com\/blog\/p0402-exhaust-gas-recirculation-a-flow-excessive-detected\/#faq-question-1768451165240","name":"Does P0402 affect emissions?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Yes. Since the EGR system directly controls NOx emissions, excessive EGR flow can disrupt proper emissions control.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.carparts.com\/blog\/p0402-exhaust-gas-recirculation-a-flow-excessive-detected\/#faq-question-1768451185178","position":7,"url":"https:\/\/www.carparts.com\/blog\/p0402-exhaust-gas-recirculation-a-flow-excessive-detected\/#faq-question-1768451185178","name":"Should P0402 be fixed immediately?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Yes. 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