My 1998 chevy astro van is showing 2 codes for P0420 what exactly does it mean
The P0420 code means that the catalytic converter efficiency
is below threshold. Since there are two oxygen sensors, above and after the
catalytic converter, they together generate signals which are used to monitor
the efficiency. However, if the catalytic converter is bad, the sensor after
the converter will generate steady results, without any fluctuations.
You can replace the catalytic converter to overcome this
problem. However, there are chances of the P0420 code to come up if there is
any leak in the exhaust or the downstream o2 sensor (after the converter) is
bad. Ideally, before spending on cat, you should try replacing the downstream
sensor, which you can buy at low price from online stores like
oxygensensorworld.com and also inspect for any small leaks in the exhaust
system. Since the converter can cost you more, think of replacing it only if
needed.
SOURCE: Pulled code p0420 on 99 chevy astro, 2wd, v6
from what i am finding the code means o2 sensors. they recommend replacing them and if this does not work than replacing the cat converter
The catalytic converter has an oxygen sensor
in front and behind it. When the
vehicle is warm and running in closed loop mode, the upstream oxygen sensor
waveform reading should fluctuate. The downstream O2 sensor reading should be
fairly steady. Typically the P0420 code triggers the Check Engine Light if the
readings of the two sensors are similar. This is indicative of (among other
things) a converter that is not working as efficiently as it should be (according
to specs). It is part of the vehicle emissions
system.
causes
A code P0420 may mean that one or more of the following has happened:
possible soloutions
Some suggested steps for troubleshooting a P0420 code include:
One thing to note is that many vehicle manufacturers offer a longer warranty
on emissions-related parts. So if you have a newer car but it's out of it's
bumper-to-bumper warranty, there still may be warranty on this type of problem.
Many manufacturers give a five year, unlimited mileage warranty on these items.
It's worth checking into.
thank you for choosing fixya and please do not forget to comment and rate on your experience.
SOURCE: What is the Diagnostic Trouble Code PO442 for a
P0442 - Evaporative Emission (EVAP) System Small Leak Detected
POSS LOOSE OR DEFECTIVE GAS CAP.
SOURCE: code p0332 and p0420
16716/P0332 - Knock Sensor 2 (G66): Signal Too Low
Possible Symptoms
Possible Causes
16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold Possible Causes
Possible Solutions
SOURCE: What do trouble codes 67,81, and 82 mean for a
67 a/c pressure sensor circuit or a/c clutch circuit failure
81 brake input circuit fault
82 ignition control (IC) 3X signal error
Testimonial: "I'll give it a try. THANK YOU VERY MUCH!!!!"
SOURCE: 1999 Chevy Astro Van. Don't know exact model # of
the code p01870 i believe it is the 1-2 shift solenoid.
927 views
Usually answered in minutes!
×