Question about 2004 Nissan Sentra

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Check engine light code P1278 - 2004 Nissan Sentra

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CODE P1278- HEATED OXYGEN SENSOR 1 SLOW RESPONSE.POSSIBLE CAUSE EXHAUST LEAK AT EXHAUST MANIFOLD OR PIPES.FAULTY PRESSURE REGULATOR LEAKING OR FUEL INJECTORS LEAKING.AND FAULTY TPS SENSOR.

Posted on Jul 08, 2010

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  • Nissan Master
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The o2 sensor could be getting flaky (needing replacement).


Posted on Jul 08, 2010

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  • Nissan Master
  • 2,359 Answers

The P1278 is air fuel ratio out of range error.

Most likely cause are air leak into the intake manifold.
Exhaust gas leaks
dirty PCV (cheap fix / check hoses and plastic parts around PCV valve)
Mass air flow sensor (MAP)

====
Unrelated info.

Did you get a letter from Nissan for the Sentra recall on 2006?

JUL 07, 2006 | Recall ID# 81936
Recall Reason ENGINE AND ENGINE COOLING Recall Date JUL 07, 2006 Model Affected SENTRA Potential Units Affected 294166
Recall Summary ON CERTAIN PASSENGER VEHICLES EQUIPPED WITH A 2.5L ENGINE, THE CRANK ANGLE SENSOR IS AFFECTED BY TEMPERATURE VARIATIONS. UNDER CERTAIN DRIVING CONDITIONS, THESE VARIATIONS IN TEMPERATURE CAN BE LARGE ENOUGH TO CAUSE A BRIEF INTERRUPTION IN THE SIGNAL OUTPUT FROM THE SENSOR.

Consequence IF THE INTERRUPTION IN THE SIGNAL FROM THE SENSOR IS SO BRIEF THAT THE ELECTRONIC CONTROL MODULE (ECM) LOGIC DOES NOT HAVE TIME TO DIAGNOSE THE CONDITION, THE ENGINE MAY STOP RUNNING WITHOUT WARNING WHILE THE VEHICLE IS DRIVEN AT A LOW SPEED INCREASING THE RISK OF A CRASH.

Remedy DEALERS WILL REPROGRAM THE ECM FREE OF CHARGE. THE RECALL BEGAN ON AUGUST 21, 2006. OWNERS MAY CONTACT NISSAN AT 1-800-647-7261.

Notes NISSAN NORTH AMERICA, INC. R0606


Posted on Jul 08, 2010

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Posted on Jan 02, 2017

rony_masc
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SOURCE: I checked the "service engine

its just not cause of MAF, mass air flow. its says that your burning of fuel is not proper. The symptoms might be Air fuel ratio(A/F) sensor is malfunction, fuel pressure, injector problem, and also MAF.check all the circuits and sensors and also service your injector.

Posted on Feb 18, 2011

charleshucke
  • 1114 Answers

SOURCE: What causes the P1278 code

CODE P1278- HEATED OXYGEN SENSOR 1 SLOW RESPONSE.POSSIBLE CAUSE EXHAUST LEAK AT EXHAUST MANIFOLD OR PIPES.FAULTY PRESSURE REGULATOR LEAKING OR FUEL INJECTORS LEAKING.AND FAULTY TPS SENSOR

Posted on Jan 23, 2011

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But as why check engine light came up,for that issue there are few help link with solutions to correct the issue.========
Click the link below:---
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CODE P1278- HEATED OXYGEN SENSOR 1 SLOW RESPONSE.POSSIBLE CAUSE EXHAUST LEAK AT EXHAUST MANIFOLD OR PIPES.FAULTY PRESSURE REGULATOR LEAKING OR FUEL INJECTORS LEAKING.AND FAULTY TPS SENSOR

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