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Codes description P0172 - System Too Rich (Bank 1)
inCarDoc posted this 20 March 2019 - Last edited 25 August 2020

Description

Indicates that front oxygen sensor (at the input of catalytic converter) detects lower than expected percentage of oxygen in exhaust gasses. Could be due to the unbalanced air-to-fuel proportion at the engine, fault oxygen sensor or other systems.

Symptoms

  • Check Engine dashboard light is ON
  • Possible lack of power and car dynamic
  • Possible increase of fuel consumption
  • Possible misfire issues 
  • Unstable work and sound from engine: stumbles, shakes

Causes

  • Faulty or dirty mass air fuel (MAF) sensor
  • Dirty or "oiled" air filter
  • Faulty fuel regulators or injectors
  • Vacuum leak
  • Worn-out spark plugs
  • Faulty oxygen sensor
  • Faulty coolant system or thermostat

Severity - moderate

Does not have immediate danger effect to the car or driver, but at longer period could lead to engine overheating and possible damage. Increasing environment pollution.

Troubleshooting

  • Check and clean MAF and oxygen sensors
  • Inspect vacuum and fuel pipes
  • Inspect and replace, if required, air filter
  • Inspect and replace, if required, fuel pressure regulators or pump
  • Inspect and replace, if required, coolant sensors or thermostat
  • Inspect and replace, if required, spark plugs
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p0172 oxygen-sensor spark-plug air-to-fuel maf-sensor air-filter rich fuel-pressure
Trouble codes P0351 Jeep Grand Cherokee 1999
inCarDoc posted this 20 March 2019
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Codes description P0350 - Ignition Coil Primary/Secondary Circuit Malfunction (P0351, P0352, P0353,P0354...,P0362)
inCarDoc posted this 20 March 2019 - Last edited 27 October 2020

Description

Indicates detection of invalid voltage of pulse signal from the ignition coil(s). Usually means brakes or shortcuts of inner our outer ignition coils or pack wiring. Errors from P0351 to P0362 address to the circuit issues of a specific coil(cylinder) number from 1 to 12.

Symptoms

  • Check Engine dashboard light is ON
  • Possible lack of power and car dynamic
  • Possible engine stalling issues
  • Could be accompanied with misfire DTCs: P0300, P0301, P0302, etc.

Causes

  • Faulty ignition coil(s) or coil pack(s)
  • Coil's primary/secondary circuit wiring or connectors issues
  • Faulty ignition system relay
  • Faulty Powertrain Control Module (PCM) or firmware

Severity - major

Does not have immediate danger effect, but high risk of engine stalling and low drivability. With a time could lead other systems malfunctioning and increasing of repair casts.

Troubleshooting

  • Inspect and fix or replace, if required, primary/secondary circuit wiring and connectors connectors
  • Pay attention to specific (x) coil if pointed with accompany P030x or P035x errors
  • Check and replace, if required, coil(s)
  • Test or replace, Powertrain Control Module (PCM) or firmware

 

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ignition-coil spark-plug p0351 pcm p0350 p0354 p0353 p0352
Codes description P0135 - O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
inCarDoc posted this 20 March 2019 - Last edited 27 October 2020

Description

Indicates increasing time for front oxygen sensor (Bank 1, Sensor 1: input of catalytic converter) to get operating condition/temperature after the cold start. Usually means brakes or shortcuts in- or out- sensor wiring. 

Symptoms

  • Check Engine dashboard light is ON
  • Possible increased fuel consumption 

Causes

  • O2 sensor heater wiring or connectors issues
  • Faulty O2 sensor heater element

Severity - low

Does not require immediate replacement, but in a log time perspective could lead to spark plugs foul-out. Increasing fuel consumption and pollution. 

Troubleshooting

  • Check and replace, if required, front oxygen sensor
  • Check and replace, if required, wiring of front oxygen sensor 
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oxygen-sensor p0135 heater bank-1 sensor-1
Trouble codes P0351 Jeep Grand Cherokee 1999
Guxano Gomez posted this 20 March 2019

Ignition Coil "A" Primary/Secondary Circuit

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jeep jeep-grandcherokee p0351 jeep-grandcherokee-1999
Codes description P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
inCarDoc posted this 19 March 2019 - Last edited 27 October 2020

Description

Indicates increasing time for rear oxygen sensor (Bank 1, Sensor 2: output of catalytic converter) to get operating condition/temperature after the cold start. Usually means brakes or shortcuts in- or out- sensor wiring. 

Symptoms

  • Check Engine dashboard light is ON
  • Possible increased fuel consumption 

Causes

  • O2 sensor heater wiring or connectors issues
  • Faulty O2 sensor heater element

Severity - low

Does not require immediate replacement, but in a log time perspective could lead to spark plugs foul-out. Increasing fuel consumption and pollution. 

Troubleshooting

  • Check and replace, if required, rare oxygen sensor
  • Check and replace, if required, wiring of rare oxygen sensor 

 

 

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oxygen-sensor p0141 heater bank-1 sensor-2
Codes description P0171 - System Too Lean (Bank 1)
inCarDoc posted this 19 March 2019 - Last edited 25 August 2020

Description

Indicates that front oxygen sensor (at the input of catalytic converter) detects higher than expected percentage of oxygen in exhaust gasses. Could be due to the unbalanced air-to-fuel proportion at the engine, fault oxygen sensor or other systems.

Symptoms

  • Check Engine dashboard light is ON
  • Possible lack of power and car dynamic
  • Unstable work and sound from engine: stumbles, shakes

Causes

  • Faulty or dirty mass air fuel (MAF) sensor
  • Malfunctioning fuel pump
  • Clogged fuel filter or injectors
  • Vacuum leak
  • Faulty oxygen sensor
  • Leaks in exhaust system

Severity - moderate

Does not have immediate danger effect to the car or driver, but at longer period could lead to engine overheating and damage. .

Troubleshooting

  • Check and clean MAF sensor
  • Inspect vacuum and air intake systems for leaks
  • Inspect and replace, if required, fuel filter
  • Inspect and replace, if required, fuel pump
  • Review and correct, if required, fuel injectors, exhaust system, other systems that have DTCs.

 

 

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check-engine oxygen-sensor lean air-to-fuel maf-sensor p0171
Codes description P0300 - Random/Multiple Cylinder Misfire Detected (P0301, P0302, P0303, P0304, P0305, P0306)
inCarDoc posted this 16 March 2019 - Last edited 25 August 2020

Description

Car's ECU detects disbalance of the engine working cycle parameters, usually variations of crankshaft revolving speed, that caused by random/multiple misfires in engine cylinders. P0300 indicates generic error with undefined cylinder. P030x (where x=1,2,3,...) points exact number of cylinder with detected misfires.

Symptoms

  • Check Engine dashboard light is ON
  • Unstable work and sound from engine: stumbles, shakes
  • Possible lack of power and car dynamic, engine shakes when accelerating
  • Could be issues with engine start

Causes

  • Faulty or worn-our spark plugs or connectors
  • Faulty coil
  • Faulty fuel injector
  • Low fuel pressure
  • Exhaust system issues
  • Low quality of the fuel

Severity - Major

Need to be fixed ASAP. With a time could lead other systems malfunctioning and increasing of repair casts.

Troubleshooting

  • Be sure using a quality fuel. If not, change fuel, clear code and wait few days driving if it re-appears.
  • Check spark plugs and coil connectors and wires, replace, if required
  • Visually inspect spark plugs, replace, if required
  • Review and correct, if required, fuel injectors, distributor cap, compression, other systems that have DTCs.

 

 

 

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p0302 check-engine p0303 p0301 p0300 misfire spark-plug p0304 p0305 p0306
Codes description P0420 - Catalyst system efficiency below threshold (Bank 1)
inCarDoc posted this 15 March 2019 - Last edited 25 August 2020

Description

Indicates that some parameters readings of oxygen sensors are out of threshold. Could be due to the improper work of the catalytic converter, faults of oxygen sensors or other car systems. Could lead to the increasing of emission pollution and decreasing of engine efficiency.

Symptoms

  • Check Engine dashboard light is ON
  • Possible lack of power and car dynamic
  • Increased fuel consumption
  • Changed smell of exhaust gasses 
  • Could be issues with cold engine start

Causes

  • Faulty catalytic converter (due to resource or low quality fuel)
  • Faulty front or rear oxygen sensor
  • Leakage in exhaust system
  • Long term car running with unbalanced parameters (misfires, spark timing, high fuel pressure, oil leakage, etc.)

Severity - moderate

Does not have immediate danger effect to the car or driver. Indicates increased pollution and could lead secondary car systems malfunctions if not fixed in a reasonable time frame.

Troubleshooting

  • Be sure using a quality fuel. If not, change fuel, clear code and wait few days driving if it re-appears.
  • Check leaks in exhaust system: manifold, pipes, mufflers. Do fixes or replacement if required.
  • Check work of the front and rear oxygen sensors with working engine. It's expected that rear sensor have steady readings, the pulse rear readings indicates faulty converter.
  • Review and correct, if required, misfires, spark timing, high fuel pressure, oil leakage, injectors, engine coolant temperature sensors, other systems that have DTCs.
  • Inspect and replace, if required, oxygen sensor(s). 
  • Inspect and replace, if required, catalytic converter.

 

 

 

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check-engine p0420 oxygen-sensor catalytic-converter
Functionality Cooling fan
inCarDoc posted this 13 March 2019

Unfortunately not.

Please note that App supports only parameters and ECU's specified with OBD-II standard, that is Engine and Emission systems (Check Engine dashboard light).

Unfortunately other car systems like do not covered with any standard. Implementation could be very different for various make-model-year. You might need the other specialized solution for exact make-model-year that declare support of all listed systems.


Thanks!

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