Q: Engine code P0430 and losing oil

asked by on

What exactly does engine light code P0430 mean?

Also I'm losing oil but nothing noticeable when idle. Maybe it's burning up or coming out the exhaust while I'm driving?

My car has 114000 miles.
My car has an automatic transmission.

Diagnostic Trouble Code P0430 means that the ECU is detecting below threshold performance from the catalytic converter. The ECU monitors the catalytic converter closely and when a low performance threshold is detected the Check Engine Light will be displayed on the dashboard. Although it is possible the catalytic converter itself is faulty, there are many other possible causes of the low efficiency that must be ruled out first, including engine misfire, fuel injector leakage, engine mechanical damage, oxygen sensors that output out of range values, and exhaust leaks.


Oil leaks can be external or internal. Internal oil leaks often occur at the valve stem oil seals and/or the valve guides as well as at worn piston rings. External leaks could occur at spark plug tube seals, the PCV grommet, oil pressure sensor, crankshaft seals, oil pan seal, head gasket, and so forth. Oil leaks should be repaired because leaking oil can damage external engine components such as rubber motor mounts. If you want the source of all oil leaks identified and the repair estimated, simply request an oil leak diagnostic. If you have further questions or concerns, do not hesitate to re-contact YourMechanic.

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. Engine code P0430 and losing oil

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: How do I remove the key fob from the ignition switch?

Removing the key from the ignition switch is very easy. First, if your vehicle has an automatic transmission, make sure that it is in PARK. Then, turn your key fob counter-clockwise to the farthest setting, OFF. Then pull the key...

Q: Oil doesn't show on the dipstick until second pull.

Hi there. What could be happening is the dipstick is binding up on the oil pan in the dipstick tube. Check the dipstick tube and make sure that it is not bent or have a kink in it. Also, when...

Q: Very hard to start vehicle

Hello. This code is also related to the catalytic converter not working properly. This can also happen when the ground wires connected to the O2 sensors are not properly hooked up causing them to send erroneous info to the computer....

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.