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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1 Answer

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).

Oct 23, 2012 | 1995 GMC Safari

2 Answers

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.

Jan 24, 2012 | Toyota 4Runner Cars & Trucks

1 Answer

O2 SENSOR LOCATION


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.


1_12_2012_2_28_20_am.jpg

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

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

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.

KEY ON ENGINE OFF (KOEO) TEST
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

1 Answer

1998 GMC Sonoma threw code P1133 02S 1/1


P1133 - Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 1 Sensor 1
I would have the repair shop see if they either damaged or left disconnected the oxygen sensor for engine cylinder bank one upstream sensor, this sensor would have been disconnected if the oil pan was removed.

Apr 20, 2009 | 1998 GMC Sonoma

1 Answer

95 gmc jimmy engine codes


9141 does not exist I will assume it is DTC P0141 HO2S Heater Performance Bank 1 Sensor 2

The VCM has the capability to monitor this process by using the Heated Oxygen Sensor (HO2S Bank 1, Sensor 2). The HO2S (Bank 1, Sensor 2), located in the exhaust stream before the catalytic converter, produces an output signal which indicates the storage capacity of the catalyst; this in turn indicates the catalysts ability to convert the exhaust emissions effectively. If the catalyst is functioning properly, the HO2S signal will be far less active than the signal produced by the Heated Oxygen Sensor (Bank 1, Sensor 1).
When the HO2S temperature measures below 360°C (600°F), the sensor will not produce any voltage and will behave like an open circuit. This will result in an Open Loop operation.
The HO2S heater provides for a faster sensor warm-up which allows the sensor to become active in a shorter period of time and remain active during long extended idle. The DTC P0141 determines if the HO2S is functioning properly by checking the response time of the sensor. This DTC is a type B DTC.

Dec 05, 2008 | 1995 GMC Jimmy

1 Answer

Running rich and lean


the codes ur getting will be thrown by a vacume leak make sure u dont have a vacume line leaking or split also check ur pcv valve for clogging

Jun 18, 2008 | 1995 GMC Safari

2 Answers

1995 GMC Sierra


Just a thought, have you checked yout TPS(throttle position sensor)? I had similar problems with my 89 GMC Jimmy 4.3l, however a code 44 is strange. Also check to see if your problems go away if you advance the timing a few degree's.

Hope this helps

Jun 15, 2008 | 1995 GMC Sierra

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