Question about 2003 Chevrolet S-10

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

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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/

Posted on Aug 06, 2010

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  • Master
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Hello and welcome. the trouble code P0420 means,In order to maintain low emissions of hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx), the engine controls system uses a 3-way catalytic converter (TWC). The catalyst within the TWC promotes a chemical reaction, which oxidizes the HC and CO that are present in the exhaust gas. This reaction converts these chemicals into harmless water vapor and carbon dioxide. The catalyst also reduces the NOx which converts into nitrogen. The powertrain control module (PCM) monitors this process using heated oxygen sensor (HO2S) bank 1 sensor 2, which is located in the exhaust stream past the TWC. The HO2S bank 1 sensor 2 produces an output signal which indicates the oxygen storage capacity of the catalyst. This determines the catalysts ability to effectively convert the exhaust emissions. If the catalyst is functioning correctly, the bank 1 of the HO2S 2 signal will be far less active than the signal that is produced by bank 1 of the HO2S 1. This indicates that the TWC oxygen storage capacity is below an acceptable threshold. in simple terms, the cat. coverter is bad and will need to be replaced. the cat. converter simply is not removing the excessive emission is it is designed to do

Posted on Aug 06, 2010

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Molson02536
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SOURCE: I have a Pontiac Vibe 2003 P0420 error code. What

Basically, your on board computer is telling you your catalytic converter is not working properly. As you know, you have a sensor in front and in back of the converter. The computer compares the waveforms from each sensor. If the sensor waveform before and after the cat are the same, then the cat is not working. You should have an analysis of the waveforms at each sensor analyzed at a shop and, if they are the same, the dealer should replace the cat if it is still under warranty. Most common would be the O2 sensor after the Catalytic converter has failed and will need to be replaced. It takes about 15 min to replace and any muffler shop can replace the O2 sensor for you.

Good luck

Posted on Dec 09, 2009

  • 27 Answers

SOURCE: 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

Posted on Feb 02, 2009

  • 135 Answers

SOURCE: p0420 code on my 2003 chevy s10

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

  • 1915 Answers

SOURCE: code reading p0420 on '99

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.

Posted on Apr 01, 2011

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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
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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.

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P0420 code on my 2003 chevy s10


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.

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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

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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

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