Q: PO402 Excessive gas recirculation code

asked by on

I have a piece of exhaust flex pipe that's cracked and it's between the manifold and the catalytic converter. Would that cause check engine PO402 code?

My car has 122248 miles.
My car has an automatic transmission.

Hi there - while a cracked exhaust tube of any sort is a problem that needs to be addressed, I don’t think it’s related to your P0402 code. P0402 indicates excess exhaust flow into the intake - probably caused the EGR valve not closing properly, or a broken EGR valve spring. I recommend a rough running inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.

Was this answer helpful?

Hello, thank you for writing in. The vehicle is likely experiencing an issue with low vacuum due to the exhaust leak. This low vacuum WILL cause the EGR system to malfunction. You should focus your attention on repairing the exhaust leak, and test to make sure the codes then go away once the computer has had time to reset. If the code does not go away at that point, you will want to look further into the EGR system and make sure it is not clogged with debris or buildup. If the problem continues after that, you may end up needing to replace the entire EGR system. For more help, contact our service department to schedule an appointment.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. PO402 Excessive gas recirculation code

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Brake lights are not working - 1999 Honda Accord

Your issues can stem from a few problems and further testing will be needed. You can trace the available voltage from the brake pedal to the brake light. The brake pedal has a brake light switch that will turn the...

Q: car needs to be smogged

Hi there. When the oxygen sensors have a reading that is similar to each other, it is an indication that the catalytic converter is not working as efficiently as it is intended. If the voltage of the downstream oxygen sensor...

Q: After 'check engine' light, diagnostic revealed P0171 and P0402

The first code, P0171, is an indication the engine is running lean. This code can indicate anything from clogged air and fuel filters to problems with O2 sensors and mass air flow sensors to intake gaskets. The other code,...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...