OBD-II trouble code
P2083: Exhaust Gas Temperature Sensor Circuit Intermittent Bank 2 Sensor 1
A momentary dropout on one bank cannot be averaged away. Protection logic has to take the worst number it was given, so a sensor that is honest 99.9 percent of the time still costs the driver power for the other tenth.
Quick facts
- System
- Powertrain
- Category
- Exhaust / Aftertreatment
- Severity
- Medium severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $120 – $900
- DIY difficulty
- Advanced DIY
Browse every code in P2000–P20E8, or start from the full code library.
What does P2083 mean?
P2083 records that the first exhaust temperature sensor on the second cylinder bank produced a reading the module could not accept as a real temperature, and then went back to behaving normally.
The part of this code worth understanding first is not the electrical fault but what the module does with it, because that is where the driver's complaint comes from. Turbocharger and aftertreatment protection are not calculated per bank and then averaged. Averaging would be unsafe: if one of two channels claims the gas is dangerously hot, the correct engineering response is to believe it, because the cost of being wrong in the other direction is a melted turbine or a scorched substrate. So arbitration takes the worst case. A single bad sample on this channel therefore moves the whole engine's protection strategy, briefly, even though the other three quarters of the sensing system disagreed with it. That is why an intermittent here produces exactly the same momentary derate as a hard failure would, and why owners describe the fault as far worse than the eventual repair suggests.
The second thing to grasp is where the mechanical stress on this particular lead comes from, because it is not the same stress that acts on a bank 1 sensor. The bank 2 sensor is on the bank furthest from the front of a transverse engine or the awkward side of a longitudinal one, and its signal has to leave the engine and reach a module mounted on the body. Somewhere in that run the harness crosses from something that rocks to something that does not. An engine on flexible mounts moves several millimetres at every gearshift, every throttle lift and every hard pull, and it moves most on the bank that sits away from the torque-roll axis. The loom section that bridges that gap is worked mechanically thousands of times a day. On the bank 1 side the equivalent run is usually shorter and better clipped, and on both downstream sensors the harness is on the body and barely moves at all. This crossing is the bank 2 upstream sensor's own weak point.
That gives the fault a correlation you can ask the driver about directly, and it is a different correlation from the one that identifies most exhaust sensor intermittents. If the occurrences cluster on gearshifts, on lifting off after a hard pull, or on pulling away sharply from a junction, the loom is being flexed by engine movement. If they cluster on bad road surfaces instead, the stress is coming from the vehicle body and the suspect list moves toward clips, brackets and the sensor's own mounting. Both are intermittents, and the distinction is worth more than any measurement made standing still.
The third factor is access, and it matters more than usual because of how this fault has to be found. Proving an intermittent generally means moving the suspect section of harness while watching a live trace, and on this sensor much of the vulnerable run is behind the engine, above the subframe or under a scuttle. Reaching in far enough to flex the right six inches, with the engine warm, is genuinely difficult. The practical alternative is to make the engine do the moving: with the vehicle safely secured, have a helper snap the throttle in neutral while the trace is recorded, or lever the engine gently against its mounts with a long bar at rest. A fault that appears when the engine rocks and not when the loom is shaken confirms the crossing point without anyone having to get a hand onto it.
One caution on parts. Because the vulnerable section here is harness rather than probe, a replacement sensor has a poorer success rate on this code than it does on the equivalent bank 1 fault, and it costs considerably more to fit. Confirm the flex point first. If the sensor is coming out anyway, the single most valuable thing to do while it is accessible is to restore every clip and every original routing point, because a lead left to hang across that gap will be back.
Common causes
- Harness fatigue where the bank 2 sensor loom crosses from the engine to a body-mounted connector or module
- Collapsed, split or hardened engine mount allowing more movement than the loom was routed for
- Broken or missing harness clip letting the lead swing freely across the engine-to-body gap
- Connector terminal fretting from repeated small movements rather than from corrosion
- Lead pinched, stretched or re-routed during gearbox, starter, turbocharger or rear manifold work
- Sensor loose in its boss so the whole assembly moves with the exhaust rather than with the head
- Cracked solder or crimp inside the sensor body from combined heat and vibration
- Ground strap between engine and body degraded, forcing return current through the signal harness
- Insulation worn through against a bracket, bulkhead or heat shield on the rear bank
- Moisture drawn into a connector sitting low behind the engine where spray collects
Symptoms
- Warning light that appears and later extinguishes on its own
- Brief loss of boost or power immediately after a gearshift or a throttle lift
- Occurrences clustering on gearshifts and hard pull-aways rather than on rough surfaces
- Bank 2 temperature trace showing isolated spikes or drops the other bank does not mirror
- Fault appearing shortly after gearbox, starter or rear manifold work
- Diesel regeneration cycles aborting partway and restarting later
- Reading normal throughout a workshop test with the vehicle stationary
- Rough or lumpy idle only if a failing engine mount is the underlying cause
- Companion bank 2 exhaust codes coming and going with no clear pattern
- No stored circuit code, because nothing stayed faulted long enough to set one
Diagnostic steps
- 1.Ask when it happens before measuring anything. Occurrences tied to gearshifts and throttle changes indicate the loom is being flexed by engine movement; occurrences tied to potholes and speed bumps point at body-side clips and brackets instead.
- 2.Establish which bank is bank 2 on this specific engine. It is the bank that does not contain cylinder 1, and that is not reliably the same side of the car from one manufacturer to the next.
- 3.Record the channel through a real drive with a graphing tool or a min and max capture. A live digital reading updates far too slowly to show a dropout that lasted milliseconds.
- 4.Inspect the engine mounts before condemning any wiring. A mount that has collapsed lets the engine travel further than the harness was ever routed for, and replacing the loom without fixing that guarantees a repeat.
- 5.Follow the harness from the sensor to the point where it leaves the engine and find the transition to body-mounted structure. That crossing is the section this code is about.
- 6.Make the engine move rather than trying to reach the loom. With the vehicle secured, snap the throttle in neutral or lever the engine gently against its mounts at rest while watching the recorded trace.
- 7.Check the engine-to-body ground strap. A degraded strap pushes return current into signal harnesses and produces intermittents on whichever channel has the longest ground path.
- 8.Open the connector and look for bright, polished wear marks on the terminals. Fretting looks different from corrosion and points directly at movement rather than moisture.
- 9.Confirm the sensor is torqued into its boss. A loose assembly follows the exhaust rather than the head, which doubles the relative movement the lead has to absorb.
- 10.Reproduce the fault on the road after any repair, using gearshifts and throttle changes rather than a stationary test. A bay test proves nothing about a fault driven by engine movement.
Repair cost
$120 – $900
Diagnosis runs $130 to $240 because this needs recorded data and a road test, and because reaching the suspect section on the rear bank takes time before any measurement is taken. Repairing and reclipping a flexed harness section is $110 to $320. Replacing a collapsed engine mount, when that is the underlying cause, is $180 to $600 and is the repair that actually ends the fault. The sensor itself is $60 to $320 in parts with 0.6 to 2.5 hours of labour depending on whether it faces the engine bay or the bulkhead. Cleaning or replacing fretted connector terminals is $70 to $200.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with exhaust gas temperature (egt) sensor replacement preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
This is an advanced DIY job. It typically requires specialty tools, scan-tool access, lifting equipment, or careful sequencing to avoid causing new failures. Plan for extended downtime and have a backup vehicle. Most owners are better served by a shop that has done this repair before.