Question about 1999 Chevrolet Blazer

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Have two codes on 1999 chevy blazer


code p0404 exhaust gas circuit a and p0101 mass air circuit a problem. what is circuit a

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  • Bruce Bracey
    Bruce Bracey May 11, 2010

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  • Chevrolet Master
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P0404 is egr flow range, remove and clean egr passage way, it maybe built up with carbon, p0101 remove and clean mass air flow sensor. you can buy the cleaner at any auto parts store. but be carefull of the inside of sensor, follow directions on can. this should help a lot!!

Posted on Aug 22, 2010

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When your catalytic converter is pluged, it will not let enough air pass threw maf causing that code. Also the back pressure will cause the egr to open when it's not supposed to causing that code. If you are lacking power pull out o2 sensor and take for a ride. Should notice increase in power. Change cat conver and u ready to go.

Posted on Jun 29, 2012

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What do the OBDII trouble codes P0401 & P0404 mean with 2001 Chevy Impala?


P0401 Exhaust Gas Recirculation Flow Insufficient Detected

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My 2006 chevy malibu doesn't want to shift gears codes P0121 & P0101 & P0420 transmission place said it's not the transmission.


P0101....Mass or Volume Air Flow Circuit Range/Performance Problem
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ISUZU TROOPER 3.2 V6 CODE P0101


P0101 ISUZU - Mass Air Flow Circuit Performancexicon.jpghttp://engine-codes.com/p0101_isuzu.htmlForum CodePossible causes- Dirty mass air flow sensor
- Dirty mass air filter
- Mass air flow sensor harness is open or shorted
- Mass air flow sensor electrical circuit poor connection
- Intake air leaks
- Faulty mass air flow sensor
Tech notes Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor

Jul 04, 2012 | 2001 Isuzu Trooper

1 Answer

P0101


P0101: MAF or VAF A Circuit Range/Perf

- Dirty mass air flow sensor
- Dirty mass air filter
- Mass air flow sensor harness is open or shorted
- Mass air flow sensor electrical circuit poor connection
- Intake air leaks
- Faulty mass air flow sensor

Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.

Feb 09, 2012 | 1999 Pontiac Grand Prix

1 Answer

These show up on computer p0101 maf sensor p0128 thermostat p0155 02s heater circuit im not getting power i need to now all the problems & solutions i have 85700 miles 2002 chevy blazer is this...


Ok, it's not the transmission.
P0101 maf sensor ( mass air flow) sensor. Change the sensor, it is located in the air intake hose that runs from the air filter housing to the throttle plate/ throttle body. Disconnect the wire from it and loosen clamps ( if equipped) and pull hose from it.
P0128 thermostat is below temperature specs, change to a 190 or 195 degree thermostat. auto parts store should be able to tell you which one you need.
P0155 the heater circuit in the oxygen sensor is bad, need new one. That is on bank 2 sensor #1. If it is a V6, looking at the engine, it would be on passenger side, screwed into the exhaust pipe near the exhaust manfold.

Sep 22, 2010 | 2002 Chevrolet Blazer

1 Answer

1998 Chevy Truck 1/2 ton 350 engine. Trouble codes P0404, P0405 and P1404. I replaced the EGR valve. Now I get t/c P0404 and P0405. Now what should I check?


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Service engine light on 2001 blazer


with the p0101 make sure you have a clean air filter. it can be bad spark plugs and or wires, or a leak in the air intake system

Jul 13, 2009 | 2000 Chevrolet Blazer

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Can you help me decode these code #'s?


Hello mark...according to the manual for Volkswagen Engine and Transmission Codes...

P0101 Mass or volume air flow circuit performance problem

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Dirt and carbon build up will cause this in some cases. You might try removing and cleaning the MAF sensor with an electrical contact cleaner first. You will still need to clear the error codes with VAG-COM and see if they return.

Good luck...i hope this helps.

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1 Answer

Disgnostic code meaning


P0404 Exhaust Gas Recirculation Control Circuit Range/Performance
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It sounds like you have a failure of the EGR valve.

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