AI4Car / Diagnostics

Codes & scan data

Name: AI4Car - OBD2 Scanner
Author: AI4Car

Read stored clues before deciding what to test.

How Cars Work

A Jeep’s rough idle and misleading scan readings

The author reported improvement after sensor work, but the repair sequence leaves limits on what can be concluded.

#livedata #oxygensensor

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Diagnostics

Rough idle that appears only when warm

When a rough idle changes with temperature, compare the conditions instead of guessing at a single part.

#roughidle #vacuumleak #fueltrim

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Diagnostics

P0171: look for the pattern behind a lean reading

A lean code means the control system is correcting a mixture condition. The code alone does not identify where the extra air or fuel change came from.

#P0171 #fueltrim #airleak

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Diagnostics

P0700 is a prompt to read the transmission module

This code often tells the engine controller that the transmission controller has reported a fault. The useful detail may be stored elsewhere.

#P0700 #transmission #scantool

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Diagnostics

Freeze-frame data is a snapshot worth saving

The conditions captured when a code was stored can help you reproduce an intermittent problem.

#freezeframe #scantool #diagnosis

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Diagnostics

Pending and confirmed codes tell different parts of the story

A pending code can show that a monitor saw a problem before the conditions for a confirmed fault were met.

#OBD2 #pendingcode #scantool

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Diagnostics

Before clearing a code, save the evidence around it

A quick photo of the full scan can preserve clues that disappear when codes are erased.

#OBD2 #codes #workflow

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How Cars Work

A cold-start temperature reading should make sense

Before the engine starts, coolant temperature should be plausible for the conditions around the car.

#coolant #livedata #temperature

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Diagnostics

A code that returns after a repair is useful new evidence

Record exactly when it came back and whether the same monitor completed. That timing can change the next test.

#verification #repair #OBD2

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