Q: Check Engine light; catalytic converters failing

asked by on

The Check Engine Light came on. Two codes came up saying two of the four catalytic converters are failing. This caused my truck to fail a smog test. I noticed my coolant overflow kept draining down to nothing after I filled it, but I don't see a leak.

Hi there. It sounds like you have a few issues going on here. If the catalytic converters are failing, then the converters will need to be replaced. They tend to either fail and become clogged causing a loss of engine power, or they simply fail and no longer react as they should. As for the loss of coolant, this engine has a history of head gasket failures even if the engine has never gotten hot. Most of the time this occurs on the driver side of the engine. A block test will reveal the problem area, but many times I’ve had to use a bore scope to look inside of the cylinders to find where the coolant is going. It is typically the rear cylinder on the driver side. If you need further assistance, a certified mechanic, like one from YourMechanic, will be able to diagnose the coolant issue.

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. Check Engine light; catalytic converters failing

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: Acceleration problems, car shaking and check engine light on

Hi there. There are a few different things that can cause this. It can be the fact that the speedometer is not working due to a bad transmission speed sensor. This can cause the computer to not know when to...

Q: MY car will not move after running for a mew minutes, engine just revs.

In this situation, I would have the transmission fluid level and condition checked first. Your symptoms sound like the fluid level may be low and once the fluid starts to circulate through the transmission, there isn't enough for the hydraulics...

Q: Truck starting without key in ignition

Hi, thanks for writing in. It sounds like you may have a faulty ignition switch that is causing your vehicle to start without the key. I would recommend having your ignition switch inspected and replaced if necessary in order to...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
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...