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P0420 code on my 2003 chevy s10 - 2004 Chevrolet S-10

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CATALYST SYSTEM LOW EFFICIENCY ,MEANING THE CAT MONITOR SENSOR WAS NOT SENDING THE CORRECT SIGNAL TO THE ECM MOST LIKELY CAUSE IS A FAULTY CAT MONITOR SENSOR OR FAULTY CATALYTIC CONVERTOR.

Posted on Aug 06, 2010

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Posted on Jan 02, 2017

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My 2005 chevy equinox keeps showing problem code P0420 How do I fix this problem?


0 2 sensor near the catalytic converter or

replace the catalytic converter

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.

Read more at: https://www.obd-codes.com/p0420
Copyright OBD-Codes.com

https://www.obd-codes.com/p0420

Feb 03, 2017 | Cars & Trucks

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My 2003 s10 started glitching. The instrument panel jumps, off and on, the rpm and speed gauage flicker off and on. Now it will not start.


Bad ground wires. Inside they will be at the steering column under the dash. And on on each side behind the side kick panels. Also check the battery to body ground and engine to body ground.

Dec 14, 2015 | Cars & Trucks

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2003 chevy trailblazer code p0420


Is your engine temperature at 210 degrees? Need a scan tool for this, the guage isn't reliable. If not, cheapest thing to do 1st would be change your thermostat if it's not at 210. If that doesn't work, have your catylitic converter back pressure tested. You could try some Cat Clean added to your gas too as cats are expensive.

Feb 28, 2014 | 2004 Chevrolet TrailBlazer

1 Answer

Where is the cabin air filter for a 2003 chevy s10


The 2003 S10 does not have a cabin air filter.

Mar 20, 2013 | 2003 Chevrolet S-10

1 Answer

Code reading p0420 on '99 chevy s10 blazer, low catalyst threshold. Is this a bad catalytic converter or burned valves?


there are a couple of things to consider here. That code indicates that the O2 sensor behind the cat is not functioning like the engine computer expects-either the cat itself is not functioning properly or you may have an exhaust leak, or the heater circuit in the O2 sensor is faulty. The cat should get up to 600 degrees and it burns unburned fuel before ti gets to the 2ed O2 sensor-if it cannot do this, the CEL comes on and you have a P0420. Before replacing the cat, clear the code and see if it comes back-if it does, you might try first replacing the O2 sensor. If that doesn't work, get a 'oil fouler' spark plug adapter and install the O2 sensor in it, then install both into the exhaust-this 'shields' the tip of the O2 sensor and slows it down, fooling the engine computer into seeing it switching slowly, as it is supposed to do. Your only other choice is to replace the cat, and an aftermarket cat is much less than an OEM unit.

By the way, if you have burnt valves, a P0420 is the least of your worries.

Apr 01, 2011 | 1999 Chevrolet Blazer

1 Answer

05 Chevy Malibu P0420 code has set the check engine light.


Hi. P0420 is a catalyst efficiency code. 100% of the time you need a new catalytic converter. If you want to be sure it is the cat pull the O2 sensor before the cat and drive it, the sluggishness will go away because there is no more restriction.

Aug 26, 2010 | 2003 Chevrolet Malibu

2 Answers

P0420 code on my 2003 chevy s10


please go to the provide link for diagnosis of this code,but the bottom line here is the catalytic converter may be worn out

http://www.p0420.com/

Aug 06, 2010 | 2003 Chevrolet S-10

3 Answers

PO420 CODE ON CHEVY S10


Hi

The code means---

Catalyst Efficiency
Below Threshold
(Bank 1)

Please make sure there is no air entering the engine behind the maf, such as a vacuum leak or leaks in ducting between the maf and the throttle body.

If that's no the case then its an issue with injectors clogging and they are not working due to "fretting". This "fretting" is electrical terminals to injectors getting oxidation on them and is fixed by unplugging them and replugging them in. The fix is to put a small dab of die-electric grease on the terminals.

I would suggest an injector service with the new GM procedure using "Top Engine Cleaner". This may be all you need but that P0420 bothers me. P0420, Catalyst System Efficiency Below Threshold, can be set by a poor connection at the PCM or a damaged wiring harness.

Please rate this soluton as FixYa if found useful.

Thanks
Rylee

Mar 01, 2009 | 2003 Chevrolet S-10

1 Answer

STARTING PROBLEMS WITH CHEVY S10 2003


first you need to check if your are getting spark, then go to fuel pressure, you should have 60lb of pressure

Jan 31, 2009 | 2003 Chevrolet S-10

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