Skip the auto shop - Our mechanics make house calls

Q: Check Engine Light P0430

asked by on

I just bought this car a few days ago from a used car finance place. They have done some work to it before I bought it. I took the car to a mechanic and he found that there was a nut missing and another loose nut on the rear exhaust manifold. A few day later my check engine light came on. A p0430 code came up ( that was the only one) now my question is can the fact that the nuts are missing and another one is loose cause the check engine light to come on and also be the reason for that p0430 code? Please help I need a little peace of mind

My car has 135442 miles.
My car has an automatic transmission.

A: Hi there. There may be two possibilities he...

Hi there. There may be two possibilities here for the P0430 code. The fact that the new bolts were installed can cause the computer to read differently so it may just need to adapt and reset. It is also possible that the seller removed these to allow for a small exhaust leak which could have helped it to pass emissions. At this point the oxygen sensor readings need to be checked to know for sure as it may need a catalytic converter. If you need to have this looked at by another technician, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the code and advise you on any actions needed.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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 problems

Hi, thanks for writing in. You may have a clogged bleeder. You may try taking the bleeder completely out and then see if fluid is flowing. If there is still no fluid coming out, you may have a pinched brake...

Q: Gas pedal not going down when pressed.

The throttle pedal may be blocked by your carpet. Check the pedal to make sure it is not being blocked. The pedal operates a cable and then to the throttle body assembly. Each of these would need to be checked...

Q: Just got code P0430. How long till catalytic converter fails completely?

Hi, thanks for writing in. This P0430 code is for the bank B or driver side converter or the O2 sensor after the converter. The code will need to be diagnosed to isolate the problem to the sensor or the...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...