HELP. P0172
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Junior Member
Joined: Jun 2025
Posts: 1
HELP. P0172
Greetings
I recently bought an XB (2006) with code P0172 thinking it would be something simple. However, after changing the MAF sensor, O2 sensors (2), throttle body, VVTI sensor, intake manifold, the problem continued. I went on to install the complete exhaust system, including the cat converter, coil packs, and fuel injectors. I also tested it for vacuum leaks, which came out fine. The last thing I replaced was the Charcoal canister and the gas tank neck, and I even tried another ECU, and the damn code still remained. I don't know what else to try. It would be a shame if, after so much investment, it didn't work, because the car, despite having 200,000 miles, has an immaculate interior and box. A little help, please.
I recently bought an XB (2006) with code P0172 thinking it would be something simple. However, after changing the MAF sensor, O2 sensors (2), throttle body, VVTI sensor, intake manifold, the problem continued. I went on to install the complete exhaust system, including the cat converter, coil packs, and fuel injectors. I also tested it for vacuum leaks, which came out fine. The last thing I replaced was the Charcoal canister and the gas tank neck, and I even tried another ECU, and the damn code still remained. I don't know what else to try. It would be a shame if, after so much investment, it didn't work, because the car, despite having 200,000 miles, has an immaculate interior and box. A little help, please.
Junior Member
SL Member
Joined: Jan 2026
Posts: 3
Greetings
I recently bought an XB (2006) with code P0172 thinking it would be something simple. However, after changing the MAF sensor, O2 sensors (2), throttle body, VVTI sensor, intake manifold, the problem continued. I went on to install the complete exhaust system, including the cat converter, coil packs, and fuel injectors. I also tested it for vacuum leaks, which came out fine. The last thing I replaced was the Charcoal canister and the gas tank neck, and I even tried another ECU, and the damn code still remained. I don't know what else to try. It would be a shame if, after so much investment, it didn't work, because the car, despite having 200,000 miles, has an immaculate interior and box. A little help, please.
I recently bought an XB (2006) with code P0172 thinking it would be something simple. However, after changing the MAF sensor, O2 sensors (2), throttle body, VVTI sensor, intake manifold, the problem continued. I went on to install the complete exhaust system, including the cat converter, coil packs, and fuel injectors. I also tested it for vacuum leaks, which came out fine. The last thing I replaced was the Charcoal canister and the gas tank neck, and I even tried another ECU, and the damn code still remained. I don't know what else to try. It would be a shame if, after so much investment, it didn't work, because the car, despite having 200,000 miles, has an immaculate interior and box. A little help, please.
Did you ever figure this out buddy?
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celicaboy87
Scion xA/xB 1st-Gen Drivetrain & Power
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Jan 22, 2026 11:56 PM