Question about 1995 GMC Safari

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Oxygen sensor code comes

In my 1995 GMC Safari, every time it gets up to opperating temperature, the check enjine light comes on. It is always the Oxygen sensor system code. I have put a different TPS on it and have replaced to oxygen sensor and still every time it gets to 195 degrees and set at a steady speed down the road the light comes on. Once dropped back to an idol light shuts off.

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  • shunkcrew May 24, 2008

    There is only 1 O2 sensor listed in the repair manual for this in front of the CAT. EGR seems to be working properly and the CAT is less than a year old. What particular parts were you refering to on the excessive wear for blow by. My van does have 249880 on it? Vaccum all seems to be intact as well.


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Check for vacuum leaks..That could be an issue

Posted on May 24, 2008

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  • Swilin Sampson
    Swilin Sampson May 24, 2008

    Make sure that the egr valve is opening up & that the passages are clear.Meaning exhaust gas
    is being recirculated.The engine must be 180-200 degrees F to burn the
    fuel properly.If this engine has an excessive amount of
    blow-by(internal wear) you are fighting a losing battle,if not replace
    the catalytic converter & change the oil.Drive it on the highway
    for a while & test it.Do not turn off engine in this time,exhaust cools off.

  • Swilin Sampson
    Swilin Sampson May 24, 2008

    By the way, there should be 4 O2 sensors. Have you checked/replaced them all?

    From my long distance evaluation, it could be a problem with the circuitry to the sensors, or other problems as well, like fuel pressure problem, intake gasket, etc. Unfortunately, this is the limitation of this forum, in that we cannot actually do any physical testing on the machine. Only an on the spot inspection can actually isolate the problem..

    In my honest opinion, its best to have a qualified mechanic take a good look and diagnose the problem.

    Hope that helps!

  • Swilin Sampson
    Swilin Sampson May 24, 2008

    I basically meant the EGR valve and most other parts linked with the exhaust system.

    Anyways, I think it is best to get the fault evaluated by a qualified mechanic..


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This is not due to the oxygen sensor some other problem i think better you check with a good mechanic

Posted on May 24, 2008

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I have a 1995 gmc safari van code reader comes up idle air control system we replaced IAC valve what else could be wrong?

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How to check for codes on 1995 gmc safari

You will need a code reader. Your local Autozone may be able to rent one to you (or even just come out and check it for you).

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P0037 code subaru outback I have replaced the cat and both o2 sensors and the same code comes up

I'm sorry you spent that money if this was the original code.

The code means one of the O2 sensors has a faulty heater or the power circuit for the heater is bad. The sensor is not heating up as fast as it should. Since you have replaced the sensor you would need to check the power circuit for the heater.

P0037 SUBARU Description Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM).

In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.

The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.
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1996 Toyota 4runner 3.4L error code p0133

SAE J2012 Revised DEC2007 lists Diagnostic Test Code (DTC) P0133 as "O2 Sensor Circuit Slow Response Bank 1 Sensor 1"

This code basically means that the upstream oxygen sensor on bank one of your engine is not responding as quickly as it should to changes in oxygen leavels in the exhaust.

The usual causes of this is an oxygen sensor that is just plain worn out (if it has a lot of miles on it) or an oxygen sensor that is contaminated by engine oil or antifreeze leaks causing these fluids to be burned in the exhaust (like bad piston rings, defective PCV valve, blown head gasket, etc.).

In any case, the oxygen sensor needs to be replaced. However it should be noted that if it is caused by contamination like that described above, replacing it will only result in a new oxygen sensor doing the same thing if the cause of the contamination is not repaired.

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Hi Greg:
On 1995 GMC Truck Sonoma 4WD 4.3L TBI 6cyl the Oxygen Sensor is located under hood, driver side, lower engine area mounted in lower exhaust manifold at pipe flange.


Fig.: Removing the oxygen sensor from the exhaust pipe

The sensor uses a permanently attached pigtail and connector. This pigtail should not be removed from the sensor. Damage or removal of the pigtail or connector could affect the proper operation of the sensor. Keep the electrical connector and louvered end of the sensor clean and free of grease. NEVER use cleaning solvents of any type on the sensor! The oxygen sensor may be difficult to remove when the temperature of the engine is below 120?F (49?C). Excessive force may damage the threads in the exhaust manifold or exhaust pipe.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Jan 12, 2012 | 1995 GMC Sonoma

1 Answer

94 grand am, engine light comes on after 20 mins. of driving. All levels o.k. Engine runs great.

The check engine light does not monitor fluid levels; it refers to the engine management system. The light coming on tells you that something in the system, e.g. fuel/air ratio, ignition timing, engine temperature and on and on is not functioning within specifications. The first step is to get a fault code from the system, such as code for an oxygen sensor, throttle position sensor, mass air flow sensor and on and on. The average vehicle has well over 50 engine management codes. Once the code is retrieved the circuit indicated by the code can be analyzed with a real time scan tool. Often the problem is simply a sensor that has gone bad, but occasionally it's an electrical connection or wiring problem rather than the sensor in the faulted circuit. Hope this helps.

Jul 01, 2011 | Pontiac Grand Am Cars & Trucks

1 Answer

Shaking when idle in first gear and black smoke when exelerate hard

It sounds like your engine is getting too much fuel. This could be due to a bad oxygen sensor, a bad engine coolant temperature sensor, a bad baro or mass airflow sensor, a bad/leaking fuel pressure regulator, or sticking fuel injectors.

Your Check Engine light should be on if it is smoking black. It should at least have a "Rich Oxygen Sensor" code. I would start by scanning the engine computer for codes.
You can do a quick check on the fuel pressure regulator by pulling the vacuum line off of it while the engine is running. If fuel comes out of the vacuum port, replace the regulator.

All of the rest of the possibilities will require reading the computer data to determine if those parts are malfunctioning. (Or you could just spend a BUNCH of money "guessing" and replacing parts like a lot of DIYers do.)

Please note that if you have a code for "Rich Oxygen Sensor" DO NOT replace the oxygen sensor - it is WORKING. If you get a code for "Lean Oxygen sensor" and it is pouring black smoke, then the problem is MOST LIKELY the oxygen sensor.

Also note that your vehicle is equipped with an EEC V computer system. The generic OBD code readers that they use (to sell you a bunch of parts you probably don't need) at the local parts stores will not work to scan your computer. You need to get your hands on a scanner that has the capability to scan your system or take it to someone who has one.

Jun 17, 2011 | 1995 Mercury Grand Marquis

1 Answer

In a 1994 GMC Sonoma, the check engine light is and and the codes it refers to is 12 and 15. What are they for?

Hi, I'm not sure what those codes stand for or what part(s) the codes are referring to but a local parts store in your area should be able to look it up and tell you. My experience with checks engine lights coming on have always been because of the oxygen sensor. Good luck if you haven't found your problem already.

Nov 29, 2010 | 1994 GMC Sonoma

1 Answer

The fan is not working on my gmc 1995 safari, but

needs sensor on radiator for te system

Jun 27, 2010 | 1995 GMC Safari

3 Answers

Check engine light comes on after approx. one minute. My code reader gives me a 214 in continuous memory ( cylinder ID circuit failure). I clear the code and it comes back. What is giving me this code?...

look 214 is not a valid code for a 1995 escort, this is an OBD1 system. here is a list of trouble codes for this year of ford no matter the model.

You should find the diagnostic connector under your hood normally by the fender on the battery side. By just using your test light and a jumper wire, it will tell you what kind of problem you got.

Model years 1984-1995 all models of Ford
1. Make sure engine is fully warmed. If in doubt, run engine at 2000 rpm for 2 minutes.
2. Turn ignition off and wait 10 seconds for system to shut off. Make sure A/C is off and transmission is in Park (automatic) or Neutral (manual).
3. Hook up light and jumper (or a tester if you have one). Turn key to ON (do not start engine). Read the codes.

How to do it?

Example code 23: your test light should flash 2 long consecutive flashes followed by 3 short pulses.

Ford's common codes for OBD1 (vehicles made before 1995)

11 system pass
12 idle control fault
13 dc motor did not move
14 engine rpm signal fault or PIP circuit failure
15 eec processor or power to KAM interrupted
16 rpm to low to check oxygen sensor test or fuel control error
17 cfi fuel control system fault or rich/lean condition indicated
18 ignition diagnostic monitor (IDM) circuit failure
19 cylinder identification (CID) sensor input failure
21 engine coolant temperature (ECT) out of self-test range
22 manifold absolute pressure (MAP) sensor circuit out of range
23 throttle positioner sensor out of self-test range
24 air charge temperature (ACT) sensor out of self-test range
25 knock not sensed during dynamic response test
26 transmission fluid temperature out of self-test range
28 loss of primary tach, right side
29 insufficient input from vehicle speed sensor
31 egr positioner sensor below minimum voltage
32 egr positioner sensor below closed limit
33 throttle positioner sensor noisy/harsh on line
34 egr valve circuit out of self-test range
35 egr valve circuit above maximum voltage
38 idle track switch circuit open
39 axod torque converter or bypass clutch not applying properly
41 oxygen sensor circuit indicates system always lean
42 oxygen sensor circuit indicates system always rich
43 oxygen sensor out of self-test range
44 air injection control system failure
45 coil 1 primary circuit failure
46 coil primary circuit failure
47 4X4 switch is closed or oxygen sensor failure
48 coil primary circuit failure
49 electronic transmission shift error
51 engine coolant temperature sensor circuit open
52 power steering pressure switch circuit open
53 throttle position circuit above maximum voltage
54 air charge temperature circuit open
55 key power input to processor open circuit
56 mass air flow circuit above maximum voltage
57 axod circuit failure
58 idle tracking switch circuit fault
59 automatic transmission shift error
61 engine coolant temperature circuit grounded
62 converter clutch error
63 throttle positioner circuit below minimum voltage
64 air charge temperature circuit grounded
65 charging system over voltage
66 mass air flow sensor circuit below minimum voltage
67 neutral/drive switch circuit open
68 transmission fluid temperature over temperature range
69 transmission shift error
70 data circuit communication link circuit failure
71 message center circuit circuit failure
72 insufficient manifold absolute pressure (MAP) change during dynamic response test
73 insufficient throttle positioner (TPS) change during dynamic response test
74 brake on/off (BOO) circuit open
75 brake on/off (BOO) circuit closed
76 insufficient air flow output change during test
77 brief wide open throttle not sensed during test
78 power interrupt detected
79 a/c on/defrost on during self test
81 map has not changed normally
82 super charger bypass circuit failure
83 OIC-low speed fuel pump relay circuit failure
84 egr vacuum regulator (EVR) circuit failure
85 canister purge circuit failure
86 shift solenoid circuit failure
87 fuel pump circuit failure
88 electro drive fan circuit failure
89 transmission solenoid circuit failure
91 no oxygen sensor switching detected
92 shift solenoid circuit failure
93 throttle positioner sensor input low
94 torque converter clutch solenoid circuit failure
95 fuel pump secondary circuit failure
96 fuel pump secondary circuit failure
97 transmission indicator circuit failure
98 electronic pressure control circuit failure
99 eec has not learned to control idle

Jan 14, 2010 | 1995 Ford Escort

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