Q: What does this code mean P0420 ? 1997 Chevy Express 1500
Catalyst efficiency below theashold light is on what does it mean engine light is on and that what it said
My car has 234 miles.
My car's transmission is unknown to me.
Recommended Services
| Check Engine Light is on Inspection | $94.99 - $114.99 | Get a Quote |
Hello - the P0420 code means the catalytic converter has lost it’s ability to burn residual fuel. This could be due to an engine condition that has clogged the catalyst, or a failing oxygen sensor that is not adequately monitoring exhaust gases, and feeding bad data to engine management. The result is the same, inadequate catalytic converter functionality. I would recommend a Check Engine inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.
The statements expressed above are only for informational purposes and should be independently verified. Please see our
terms of service
for more details
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
What others are asking
How do you use the keyless entry pad to activate/deactivate the Auto Unlock feature?
You can activate and deactivate the Auto Lock and Auto Unlock features separately from one another on your car. You can also use a number of different methods to do it. Here’s what you should know about using the keyless...
Car cranking but not starting.
This vehicle engine and year has more than one possible failure for this complaint and no one stands out more than the fuel pump in the fuel tank. It is also possible that it could be could be a crank...
How do I set the temperature to synchronized mode?
When your vehicle is in synchronized mode, then the temperature settings will remain the same for both the driver and the front passenger. To turn on synchronized mode, press the SYNC button, then control the temperature settings with the driver’s...
Engine light coming on
Hello. Code P0446 comes up due to a problem with the EVAP emissions vent system. This system collects evaporating fuel so that it does not get released into the atmosphere. The code almost always means that the vent valve has...
Overheating 2000 Jeep Grand Cherokee
Any leaks in the cooling system will not allow the system to hold pressure. The cooling system holds pressure to raise the boiling point of the coolant. You need to get the leak fixed and make sure all the air...
Service "A" with low tire pressure reading needing scheduled maintenance.
Service A is supposed to be performed after the first year/10,000 miles of ownership, then every 2 years/20,000 miles going forward. This service includes: Oil and filter change (https://www.yourmechanic.com/services/change-oil-and-filter) Resetting of the maintenance reminder (https://www.yourmechanic.com/services/reset-maintenance-reminder-system) Tire condition/pressure check (https://www.yourmechanic.com/services/uneven-tire-wear-inspection) (this...
Trunk won't open with either key or trunk lever.
You will need to call a vehicle locksmith to check lock and get into the vehicle trunk for you. If the lock is seized then the lock may need to be drilled out and replaced. The latch may be damaged...
The fan clutch will not disengage.
Hi there. The fluid that is inside the fan clutch has leaked out and is no longer keeping the clutch is a slipping mode until it gets hot. I recommend replacing the fan clutch assembly (https://www.yourmechanic.com/services/fan-clutch-replacement). If you need further...
PATHFINDER 2005 VDC OFF LIGHTS COMES ON
I believe this is the traction control light for this particular vehicle. The most common cause of this issue would be a faulty wheel speed sensor (https://www.yourmechanic.com/services/abs-speed-sensor-replacement). I would recommend having the trouble codes read to determine the exact cause...
Related articles
A Buyer’s Guide to the 2012 Chevrolet Impala
A A true classic, the 2012 Chevrolet Impala may not have all of the latest high-tech features of other sedans on the market, but it is a tried-and-true model with lots of room, plenty of comfortable features, and a large...
The Best Used Cars to Buy If You’re an Athletic Coach
If If you are an athletic coach, you need a used vehicle with tons of room to transport gear. Once in awhile, you may have to take a player or two along with you as well. What this means is...
The Best Used Cars to Buy If You're a Farmer
If If you're a farmer, you know that what you need isn’t a used car – it’s a used pickup truck. How else are you going to haul around hay, implements, garden produce, fertilizer, and all the other things you...
Browse other content
Estimates
Cities
Services