Question about 2002 Chevrolet S-10

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Open circuit in o2 sensor from the ck eng codes 60000 miles on the trk never had a problem could this be cat w/bad function code

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  • mik4902 Jul 18, 2009

    unk code is my sons trk its a 2002 s 10 ext cab my son had the computer at azone check and it came back as open o2 sensor circuit he s replaced 1 of the sensors and the info i ve gotten its not unusual to get bad readings i thought it might be a bad or plugged cat but he s getting normal gas milage

  • Salvador Quintanilla May 11, 2010

    What code did you have?

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An open circuit code for an O2 sensor would not be a catalytic converter. An open cicuit code would normally indicate a faulty O2 sensor. 60,000 miles would be about right for this sensor to go bad, especially with all the additives in todays fuel. Hope this helps

Posted on Jul 18, 2009

  • Ed Warden
    Ed Warden Jul 18, 2009

    An open circuit code for an O2 sensor would not be a catalytic converter. An open cicuit code would normally indicate a faulty O2 sensor. 60,000 miles would be about right for this sensor to go bad, especially with all the additives in todays fuel. Hope this helps

  • Ed Warden
    Ed Warden Jul 18, 2009

    An open circuit code for an O2 sensor would not be a catalytic converter. An open cicuit code would normally indicate a faulty O2 sensor. 60,000 miles would be about right for this sensor to go bad, especially with all the additives in todays fuel. Hope this helps

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How many eng. Sensors on a 2000 GMC safari 4.3L Replaced mass air flow crankshaft sensor and ck eng. Lite still on. What's next O2 sensor? Thanks


Have it scanned so we can try to pinpoint the issue before you spend money on a nonissue. Codes can direct you to the circuit or sensor problem.

Nov 15, 2015 | GMC Cars & Trucks

1 Answer

Pontiac Aztek 2001 - 3.4l (non-GT); Codes: P0135, P0141, P0420 all O2 + Converter. Ideas on problem?


P0135 bank 1 sensor 1 open or short in wires,bad connections,bad sensor ,or bad ecm. P0141 bank 1 sensor 2 same diag as P0135. P0420 cat below threshold open or short, or faulty Ho2s sensors.you may have several problems. start with sensors circuit if good change sensors if not trace to ecm if reading not right replace ecm if all good replace sensors clear codes retest drive two drive cycles for cat to clear tests. then with no dtcs present test fuel pressure , injectors,then ignition system ,timing valves ,map,maf sensors,throttle sensor,crank sensor cam sensor, compression.

Aug 02, 2012 | 2001 Pontiac Aztek

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

1999 miata has check engine light on. i turned it off and it stayed out for about a month. took to autozone had two codes exuast and cat. converter. whats wrong with this car?


exhaust doesnt sound like a code, there should be more to code than cat or exhaust, the cat code is probably like cta efficencey below thrushold. this means the converter is not working, the cause maybe bad cat or bad oxygen sensors, testing may be needed to see if o2 sensors are working good. the exhaust code i dont know, never heard of exhaust code, they may be caused by the same problem, start with the cat code, have o2 sensors (oyxgen sensor) checked or if over 100,000 miles replace them. if converter is bad it a very good thing to also replace the o2 sensors with the new cat.

Aug 20, 2010 | 1999 Mazda MX-5 Miata

2 Answers

Error code p0032 on 2004 dodge caravan. what is the code?


Hi.

P0032 means HO2S Heater Control Circuit High (Bank 1 Sensor 1).

It means high impedance from O2 sensor, check wiring to sensor and replace the sensor.
Check O2 sensor located in bank 1 (cylinder 1 side- see here), and after the catalitic converter (there is also an O2 sensor before cat converter).

Jul 31, 2010 | 2004 Dodge Caravan

4 Answers

Would like to check 02 sensor


A scan tool would work better.Then you can monitor the o2 while the vehicle is running.Also check the exhaust system to make sure it is not kinked or the exhaust system is blocked.If it is good then the problem is usually the catalytic converter.Hopoe this helps.Good luck.

Mar 15, 2010 | 1999 Chevrolet Cavalier

2 Answers

01 toyota tundra stalls at idle....engine code p0420


Could be a problem with the Catalytic Converter or oxygen sensor (H02S bank 2 )

Sep 09, 2009 | 2001 Toyota Tundra

1 Answer

No ck eng. lt, but have error codes on scanner


Yes. 1 is a bad O2 sensor and the other a mis-fire.

Best thing to do is a major tune up (replace plugs/wires/fuel filter/PCV valve/etc...) and also replace the Bad O2 sensor.

Running it like this can cause long term damage. Let alone you are losing gas milage as well.

Good luck.

Apr 16, 2009 | 1997 Dodge Caravan

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