P0173Fuel Trim Malfunction (Bank 2)
Voici ce que signifie le code défaut P0173, pourquoi il apparaît et que faire à son sujet.
Système: Fuel & air metering
Généralement sans danger sur de courtes distances, mais faites-le contrôler rapidement.
Ce que signifie P0173
The engine computer adjusts how much fuel it adds based on readings from the oxygen sensors. This code means the correction needed on bank 2 (the engine side that does not contain cylinder #1) has gone too far in one direction. In practice the mixture is too rich or too lean and the computer can no longer compensate within its normal range.
Symptômes courants
- Check engine light on
- Rough or unstable idle
- Reduced fuel economy
- Hesitation or stumble during acceleration
- Possible hard starting
Causes courantes
Classées de la plus courante à la moins courante.
- 1Vacuum or intake air leak (unmetered air)
- 2Failing or dirty mass airflow (MAF) sensor
- 3Faulty oxygen sensor on bank 2
- 4Fuel delivery problem (weak fuel pump, low pressure, clogged or leaking injectors)
- 5Clogged or dirty fuel filter
- 6Exhaust leak near the oxygen sensor
- 7Vacuum leak from PCV system or hoses
Que faire
Have the live fuel-trim data read to see whether the system is running rich or lean, which narrows the cause quickly. Check for vacuum leaks and inspect the MAF sensor and fuel pressure before replacing parts. It is generally fine to keep driving short trips, but fix it soon to avoid wasted fuel and possible catalytic converter wear.
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Questions fréquentes
Que signifie le code P0173 ?
The engine computer adjusts how much fuel it adds based on readings from the oxygen sensors. This code means the correction needed on bank 2 (the engine side that does not contain cylinder #1) has gone too far in one direction. In practice the mixture is too rich or too lean and the computer can no longer compensate within its normal range.
Quelles sont les causes du code P0173 ?
Les causes les plus courantes sont : Vacuum or intake air leak (unmetered air), Failing or dirty mass airflow (MAF) sensor, Faulty oxygen sensor on bank 2, Fuel delivery problem (weak fuel pump, low pressure, clogged or leaking injectors), Clogged or dirty fuel filter, Exhaust leak near the oxygen sensor, Vacuum leak from PCV system or hoses.
Peut-on rouler sans danger avec le code P0173 ?
Généralement sans danger sur de courtes distances, mais faites-le contrôler rapidement.
Comment corriger le code P0173 ?
Have the live fuel-trim data read to see whether the system is running rich or lean, which narrows the cause quickly. Check for vacuum leaks and inspect the MAF sensor and fuel pressure before replacing parts. It is generally fine to keep driving short trips, but fix it soon to avoid wasted fuel and possible catalytic converter wear.
Ce sont des informations générales pour vous aider à comprendre le code P0173, et non un substitut au diagnostic d’un mécanicien qualifié. Confirmez toujours la cause avant de remplacer des pièces.
Les définitions des codes suivent la liste OBD-II normalisée (SAE J2012). CarVinVin est indépendant et n’est affilié à aucun constructeur.