📖 What Does P0402 Mean?
Symptoms
- • Rough idle
- • stalling
- • poor acceleration
- • black smoke from exhaust
- • knocking
- • check engine light.
Common Causes
- • EGR valve stuck open
- • faulty EGR valve position sensor
- • vacuum leaks causing excessive EGR flow
- • carbon buildup preventing valve closure.
Possible Solutions
Replace EGR valve, clean EGR valve and passages, repair vacuum system, replace EGR position sensor.
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❓ Common Questions About P0402
Can I drive with code P0402?
You can drive for a short time, but should address code P0402 soon to avoid worsening the problem or failing an emissions test.
How much does it cost to fix P0402?
The estimated repair cost for code P0402 is between $50 and $350. This includes parts and labor for most makes and models.
Is this code easy to fix myself?
This repair is considered moderate. It may require specialized tools or significant disassembly. Professional help is recommended if you aren't an experienced DIYer.
Required Parts
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View Best Sellers ↗Related Diagnostic Codes
Other codes that may appear with P0402
P0400: Emissions Control System Malfunction
Exhaust Gas Recirculation Flow Insufficient Detected
P0403: Emissions Control System Not Operating Within Normal Parameters
Exhaust Gas Recirculation Circuit Range/Performance
💡 Why These Codes Are Related:
- • Similar Issues: Same root cause or component failure
- • Related Problems: Often occur together due to system interactions
- • Sequential Codes: Progressive failure stages or multiple sensors
- • Same System: Components within the same automotive system