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Learn what P0139 means, symptoms, causes, and diagnostic steps for a slow downstream oxygen sensor P0139 Overview Code P0139 Code Type P Code Class P0 System Engine, Emissions Severity Level Low Emissions Related true Drivability Impact None Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P0139 indicates a slow response from the oxygen sensor circuit for Bank 1 Sensor 2 Symptoms Check Engine Light illuminated Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products Slow downstream O2 response affects catalyst efficiency monitoring Possible Causes Aging oxygen sensor Diagnostic Steps 1 Confirm the fault code; 2 Monitor sensor response time; 3 Replace the oxygen sensor if slow response is confirmed Drive Safety Notes Driving is safe, but emissions monitoring accuracy is reduced

P0136 diagnostic trouble code explained Learn symptoms, causes, and diagnostic steps for a downstream oxygen sensor fault P0136 Overview Code P0136 Code Type P Code Class P0 System Engine, Emissions Severity Level Low Emissions Related true Drivability Impact None Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P0136 indicates a malfunction in the oxygen sensor circuit for Bank 1 Sensor 2 Symptoms Check Engine Light illuminated Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products The downstream oxygen sensor monitors catalytic converter efficiency Possible Causes Faulty oxygen sensor; Wiring issues; Exhaust leaks Diagnostic Steps 1 Confirm the fault code; 2 Inspect wiring and exhaust system; 3 Monitor live O2 data; 4 Replace the sensor if necessary Drive Safety Notes Driving is generally safe, but emissions monitoring may be affected

Learn what P0671 means and how to diagnose glow plug control circuit malfunctions in cylinder 1 P0671 Overview Code P0671 Code Type P Code Class P0 System Engine Severity Level Medium Emissions Related true Drivability Impact Major Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P0671 indicates a malfunction in the glow plug control circuit for cylinder 1 Symptoms Hard starting Engine misfire Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products Glow plug control system Possible Causes Faulty glow plug for cylinder 1 Wiring issues Diagnostic Steps 1 Inspect glow plug for cylinder 1 2 Test glow plug control circuit Drive Safety Notes A malfunctioning glow plug can lead to difficult cold starts

Learn what P0493 means and how to diagnose EGR pressure sensor issues P0493 Overview Code P0493 Code Type P Code Class P0 System Emissions Severity Level Medium Emissions Related true Drivability Impact Major Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P0493 indicates a malfunction in the EGR pressure sensor Symptoms Poor acceleration; Engine misfire Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products EGR pressure sensor Possible Causes Faulty EGR pressure sensor; EGR sensor wiring fault Diagnostic Steps 1 Inspect EGR pressure sensor 2 Test sensor output Drive Safety Notes Potential emission failures

Learn what P0672 means and how to diagnose glow plug control circuit malfunctions in cylinder 2 P0672 Overview Code P0672 Code Type P Code Class P0 System Engine Severity Level Medium Emissions Related true Drivability Impact Major Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P0672 indicates a malfunction in the glow plug control circuit for cylinder 2 Symptoms Difficulty starting Engine misfire Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products Glow plug control system Possible Causes Faulty glow plug for cylinder 2 Wiring issues Diagnostic Steps 1 Inspect glow plug for cylinder 2 2 Test glow plug control circuit Drive Safety Notes Issues with cylinder 2 glow plug can affect engine startup

Learn what P0851 means and how to diagnose transmission control module circuit malfunctions P0851 Overview Code P0851 Code Type P Code Class P0 System Transmission Severity Level High Emissions Related true Drivability Impact Major Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P0851 indicates a malfunction in the transmission control module (TCM) circuit Symptoms Poor shifting Slipping transmission Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products Transmission control module (TCM) Possible Causes Faulty TCM Wiring or electrical issues Diagnostic Steps 1 Inspect TCM2 Test TCM circuit Drive Safety Notes A malfunctioning TCM can affect shifting and transmission performance

Learn what P0600 means and how to diagnose ECM/TCM communication malfunctions P0600 Overview Code P0600 Code Type P Code Class P0 System Engine Severity Level High Emissions Related false Drivability Impact Major Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P0600 indicates a malfunction in the communication between the ECM and the TCM Symptoms Poor shifting; Check Engine Light Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products Engine Control Module (ECM) and Transmission Control Module (TCM) Possible Causes Faulty wiring; ECM/TCM communication failure Diagnostic Steps 1 Inspect wiring 2 Test ECM and TCM communication Drive Safety Notes Transmission may be affected

Learn what P0306 means, symptoms, causes, and diagnostic steps for a cylinder 6 misfire P0306 Overview Code P0306 Code Type P Code Class P0 System Engine Severity Level High Emissions Related true Drivability Impact Major Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P0306 indicates a misfire detected in cylinder 6 Symptoms Engine shaking; Rough idle Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products Misfires affect engine power and emissions Possible Causes Faulty spark plug or coil; Injector malfunction Diagnostic Steps 1 Confirm misfire cylinder; 2 Inspect ignition system; 3 Test injector operation Drive Safety Notes Continued driving may damage emissions components

Learn what P0733 means and how to diagnose third gear ratio problems P0733 Overview Code P0733 Code Type P Code Class P0 System Transmission Severity Level High Emissions Related false Drivability Impact Major Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P0733 indicates incorrect gear ratio in third gear Symptoms Slipping at highway speeds Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products Third gear operation Possible Causes Internal clutch failure Diagnostic Steps 1 Compare speed data 2 Inspect transmission internals Drive Safety Notes Transmission damage risk

Learn what P2138 means and how to diagnose accelerator pedal position sensor correlation issues P2138 Overview Code P2138 Code Type P Code Class P0 System Engine Severity Level High Emissions Related false Drivability Impact Major Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P2138 indicates a correlation error between accelerator pedal position sensors Symptoms No throttle response Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products Accelerator pedal input Possible Causes Pedal sensor failure Diagnostic Steps 1 Monitor APP sensor data; 2 Inspect pedal wiring Drive Safety Notes Vehicle may not accelerate

Learn what P0874 means and how to diagnose transmission fluid pressure sensor circuit malfunctions P0874 Overview Code P0874 Code Type P Code Class P0 System Transmission Severity Level High Emissions Related true Drivability Impact Major Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P0874 indicates a malfunction in the transmission fluid pressure sensor circuit Symptoms Harsh shifting Slipping transmission Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products Transmission fluid pressure sensor Possible Causes Faulty fluid pressure sensor Wiring or electrical issues Diagnostic Steps 1 Inspect fluid pressure sensor2 Test sensor circuit Drive Safety Notes A malfunction in the fluid pressure sensor can lead to poor shifting and slipping of the transmission