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2003 Toyota T&C Multiple OBD2 Codes: P0106, P0107, P0108, P0122, P1478, P1598 - Diagnosis and Fixes

Model: 2003 T&C Fault Code: P0106 Posted: 2015-08-18 21:52

I'm experiencing persistent OBD2 fault codes on my 2003 Toyota T&C: P0106, P0107, P0108, P0122, P1478, and P1598. All other codes clear after resetting the system, but these remain active. I've already replaced the catalytic converter and both oxygen (O2) sensors. Battery and alternator tests show no issues. No vacuum leaks have been detected during inspection. The vehicle exhibits inconsistent performance, particularly at idle. I'm seeking expert input on possible root causes or diagnostic steps to resolve this issue.

Related fault codes
P0106P0107P0108P0122P1478P1598
Comments (7)
Anonymous 2015-08-19 10:51

P0106, P0107, and P0108 are typically related to the Manifold Absolute Pressure (MAP) sensor. P0122 points to a Throttle Position Sensor (TPS) issue. P1478 indicates a battery temperature sensor fault. P1598 relates to an AC transducer problem. Try disconnecting each sensor one at a time and monitor voltage readings. A faulty AC or TPS is likely—start with the AC sensor first. Sorry, I'm currently busy but will provide more details later.

Anonymous 2015-08-27 13:07

I have this code appearing on my vehicle as well. The scan tool consistently shows a high voltage reading during diagnostics.

Anonymous 2015-08-27 13:31

I'm seeing P0108 on my 2003 Toyota T&C, along with a high voltage signal detected on the scan tool.

Anonymous 2015-08-27 14:16

oysam1 - Please start a new topic specifying your vehicle's full details: year, make, model, engine type. For accurate troubleshooting, refer to OBD2 code resources like http://www.obd-codes.com/ask.

Anonymous 2015-09-04 15:12

I identified the issue: the wiring harness near the coil pack has melted, causing intermittent signal faults.

Anonymous 2015-09-07 02:56

Thanks for the help. The actual problem was a melted wire harness located beside the coil pack and power steering reservoir. I just realized this reply came later than expected—still very grateful for the input.

Anonymous 2015-09-07 03:03

The vehicle exhibits noticeable jerking during idle. What component or system is most likely responsible for this behavior?