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What does it mean when you get GM dtc code P1639 . on my code reader says O2sensor B1S1 fail lean to rich rich to lean response ratio mean ?would replacing the sensor fix it originally got a 5 v

2002 firebird v 6 3800

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Bank 1 Sensor 1 is the oxygen sensor, the error is because the difference in readings between the sensors I don't know what you mean about 5V

Posted on Dec 27, 2017


  • 1 more comment 
  • billy miller Dec 28, 2017


  • billy miller Dec 28, 2017


  • Brad Brown Dec 28, 2017

    If the code or error for the oxygen sensor is gone and not showing on the obd reader, there is no reason to change that sensor. The 5 volt error is due to the PCM using the air conditioner sensor voltage as a reference and it is not seeing 5 volts, this could be a bad sensor, bad connection etc.



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Posted on Jan 02, 2017



  • 14 Answers

SOURCE: Want to know what PO172 System too rich bank 1

it means your cars computer is pumping too muchgas into your motor because it thinks the engine is either running lean possibly due to faulty o2 sensors or that the coolant temp sensor is giving false readings and the ecm thinks the car is still too cold.

Posted on Mar 02, 2009


  • 106 Answers

SOURCE: 2002 Dodge Caravan, Tranny would shift, DTC P0700, P0725

replace the input speed sensor to transmission and the wiring pigtail all are available at your chrysler dealer take your vehicle registration in to the parts counter so they have your vin # to get the right part and it is the front of trans by fluid linres to radiator.

Posted on Mar 08, 2009


Onifade Adewunmi

  • 2004 Answers

SOURCE: need list of fault codes for gm firebird 2000.


Good luck and rate this solution.

Posted on Sep 17, 2009


  • 301 Answers

SOURCE: my 2001 cadillac deville keeps giving me dtc code system to lean

Anytime I get a too lean DTC I first change the fuel filter if it hasn't been changed in awhile. You'd be surprised how many times this has helped.

Good Luck with it.


Posted on Oct 22, 2009


  • 24 Answers

SOURCE: 1996 jaguar xj6 dtc test code p1178

Fault code P1178Rich Fuelling Trim, Long Term (AMFR)Check for manifold air leaks, rectify as necessary Check for recorded MAFS fault code, rectify as necessary Clear fault code and perform service drive cycle to verify fault cleared Contact Jaguar Service Hotline if fault still present.

Taken from the Jag service manual.

Posted on Mar 30, 2010

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