Trouble code 44 lean exhaust detected.

GM OBD Trouble Code 44

Auto Systems and Repair

Oxygen Sensor Error (Lean Condition Indicated) The ECM receives a signal from the O2 sensor based on the amount of oxygen in the exhaust. If there is excess oxygen in the exhaust, it is in lean condition and the O2 sensor voltage will be low. The ECM uses this information to adjust the amount of fuel delivered to each cylinder.
Fault Code Description

• 44 - Oxygen sensor error (lean condition indicated)
• On V-type engines with two O2 sensors, code 44 would indicate the left bank sensor is lean

Symptoms

• Lack of power

Common Problems

• Faulty O2 sensor
• Engine vacuum leak

I agree it sounds like the magnet for the cam sensor, or a problem in the wiring harness.
I don't think the engine will run with the cam sensor disconnected since it needs that signal to set base timing. It can run without the crank sensor once the engine starts.
There is a slight chance the timing chain is getting loose and affecting cam timing too. You may be loosing plastic teeth on the cam gear.

I dont know what kind of vehicle or motor but just a guess would be an Oxygen sensor, a code 44 emits lean exhaust detected,code 45 is rich exhaust detection... again i dont what kind of car so u may have a couple or more .

Here is a code list for you. Remember this doesn't always mena a sensor issue, the problem can be in the wiring as well, or in the case of a lean code you may have an actual lean condition due to a vacuum leak at the intake or vacuum hoses or connections. I have highlighted your fault codes and added extra notes.
GM common codes for OBD1 (for vehicles made before 1995)
12 System normal
13 oxygen sensor circuit open
14 coolant sensor high resistance or shorted
15 coolant sensor circuit low or open
16 direct ignition system (DIS) fault in circuit
17 cam position sensor fault
18 crank or cam sensor error
19 crank sensor circuit fault
21 tps sensor out of range
22 tps sensor signal voltage low
23 intake air temp sensor out of range, low
24 vehicle speed (vss) sensor circuit fault
25 air temp sensor sensor out of range, high
26 quad-driver module (computer) circuit #1 fault
27 quad-driver module (computer) 2nd gear circuit
28 quad-driver module (computer) circuit #2 fault
29 quad driver module (computer) 4th gear circuit
31 camshaft position sensor fault
32 egr circuit fault
33 map sensor signal out of range, high
34 map sensor signal out of range, low
35 idle air control sensor circuit fault
36 ignition system circuit error
38 brake input circuit fault
39 clutch input circuit fault
41 cam sensor circuit fault, igntion control circuit fault
42 electronic spark timing (EST) circuit grounded
43 knock sensor malfunction or electronic spark control (ESC) circuit fault (ignore this for now)
44 oxygen sensor lean exhaust (make sure you no engine vacuum leaks)
45 oxygen sensor rich exhaust
46 pass-key II circuit or ps.pressure switch circuit fault
47 pcm-bcm data circuit
48 misfire diagnosis
51 calibration error, mem-cal, ecm or eeprom failure
52 engine oil temperature circuit, low temperature indicated
53 battery voltage error or egr or pass-key II circuit
54 egr system failure or fuel pump circuit low voltage
55 a/d converter error or pcm not grounded or lean fuel or frounded reference voltage
56 quad-driver module #2 circuit
57 boost control problem
58 vehicle anti-theft system fuel enable circuit
61 a/c system performance or degraded oxygen sensor signal
62 engine oil temperature high temperature indicated
63 oxygen sensor right side circuit open or map sensor out of range
64 oxygen sensor right side lean exhaust indicated
65 oxygen sensor right side rich exhaust indicated
66 a/c pressure sensor circuit low pressure
67 a/c pressure sensor circuit or a/c clutch circuit failure
68 a/c compressor relay circuit failure
69 a/c clutch circuit head pressure high
70 a/c refrigerant pressure circuit high
71 a/c evaporator temperature sensor circuit low
72 gear selector switch circuit
73 a/c evaporator temperature circuit high
75 digital egr #1 solenoid error
76 digital egr #2 solenoid error
77 digital egr #3 solenoid error
79 vehicle speed sensor (vss) circuit signal high
80 vehicle speed sensor (vss) circuit signal low
81 brake input circuit fault
82 ignition control (IC) 3X signal error
85 prom error
86 analog/digital ecm error
87 eeprom error
99 power management

Hi Galant5Rov,

Firstly, congratulations to you on identifying the Trouble Code. This code relates to the Heated Oxygen Sensor (H02s)

The oxygen sensors supply the computer with a signal that indicates a rich or lean condition during engine operation (i.e. fuel/air metering).

This input information assists the computer in determining the proper air/fuel ratio. A low voltage signal from one or more sensors indicates too much oxygen in the exhaust (lean condition) and, conversely, a high voltage signal indicates too little oxygen in the exhaust (rich condition).

The oxygen sensors are threaded into the exhaust manifold and/or exhaust pipes on all vehicles.

A faulty oxygen sensor due to loose connections, bad grounds, high resistance in the circuit, or opens in the circuit can cause the following symptoms.
Related Symptoms

• Surging at idle
• Unstable idle
• Running rough off idle
• Hesitation
• Stumble
• Chuggle
• Poor fuel economy
• Spark knock
• Stalling on acceleration

You must take EXTREME care when removing these sensors, as they can be difficult to remove (seize up). You may require a special tool to remove these without causing damage to the sensor.

Cheers,


"If this has helped you in any way, please rate this solution" :-)

Code 44
oxygen sensor detecting lean exhaust

ERROR CODE MALFUNCTION DESCRIPTION

12 ERROR CODE DIAGNOSTIC SYSTEM FUNCTIONING CORRECTLY

13 OXYGEN SENSOR CIRCUIT OPEN

14 COOLANT TEMPERATURE SENSOR CIRCUIT (HIGH TEMP)

15 COOLANT TEMPERATURE SENSOR CIRCUIT (LOW TEMP)

21 THROTTLE POSITION SENSOR (TPS) CIRCUIT (HIGH)

22 THROTTLE POSITION SENSOR (TPS) CIRCUIT (LOW)

23 MANIFOLD AIR TEMP (MAT) CIRCUIT (LOW TEMP)

24 VEHICLE SPEED SENSOR (VSS) CIRCUIT FAILED

25 MANIFOLD AIR TEMP (MAT) CIRCUIT (HIGH TEMP)

31 WASTEGATE SOLENOID ELECTRICAL SIGNAL FAILED

32 EXHAUST GAS RECIRCULATION (EGR) CIRCUIT

33 MASS AIR FLOW (MAF) CIRCUIT (HIGH)

34 MASS AIR FLOW (MAF) CIRCUIT (LOW / NO SIGNAL)

35 CODE NOT USED ON TURBO CARS

41 CAM SENSOR CIRCUIT FAILURE

42 C3I ELECTRONIC SPARK TIMING (EST) FAILURE

43 ELECTRONIC SPARK CONTROL (ESC) FAILURE

44 OXYGEN SENSOR CIRCUIT (LEAN EXHAUST)

45 OXYGEN SENSOR CIRCUIT ( RICH EXHAUST)

51 PROM ERROR

52 CALPAK ERROR

53 WATER INJECTION

54 CODE NOT USED ON TURBO CARS

55 ECM ERROR

Return to Chart
CODE 12

Trouble Code 44 indicates that the O2 sensor is showing a persistently high exhaust oxygen content (lean), despite the efforts of the ECM to increase ...
Code 42 : Electronic spark timing (EST) circuit fault

Code 33 is MAF sensor (mass airflow sensor ) & 44 is lean exhaust mixture. My guess is 33 is causing 44.

Trouble Code 33 and 34 are the MAF/MAP Sensor Circuit. It sounds like you've replaced that sensor already. Did you also have the code 34 before putting in the new sensor?
Or did this code start after it's replacement? Any other codes appearing?

Troubleshooting it would depend if it has the Speed Density Update. The dealer should be able to provide that info.

Here's your fault code list:

13 oxygen sensor circuit 14 coolant temp sensor circuit (high temp) 15 coolant temp sensor circuit (low temp) 21 throttle position sensor (TPS) circuit (high signal) 22 throttle position sensor (TPS) circuit (low signal) 23 manifold air temp (MAT) circuit (low temp) 24 vehicle speed sensor (VSS) circuit 25 manifold air temp (MAT) circuit (high signal) 31 wastegate solenoid electrical circuit 32 exhaust gas recirculation (EGR) circuit 33 mass air flow (MAF) circuit (gm/sec high) 34 mass air flow (MAF) circuit (gm/sec low) 41 cam sensor circuit 42 C3I EST or bypass circuit failure 43 electronic spark control (ESC) circuit 44 oxygen sensor circuit (lean exhaust) 45 oxygen sensor circuit (rich exhaust) 51 PROM error 52 calpak error 55 ECM error