Can I just replace the bank 2 sensor and hope?

This is the one code in the family where that is a bad idea. On a rear-head sensor the part is often a small fraction of the invoice and access is the rest, so a wrong guess means paying for the whole job a second time. Check terminal tension and the connector first, and use recorded data to confirm the fault is in the sensor rather than the connection. Being sure before you buy is worth the extra diagnostic hour here in a way it is not on bank 1.

Why would the connector be the most likely cause on this bank?

Because it is the one that keeps getting unplugged. Working on the back of an engine — plugs, coils, a manifold gasket — usually means disconnecting whatever is in the way, and each reconnection stretches the female terminals slightly. Once a terminal has lost its spring tension it holds contact while everything is still and lets go under engine movement or heat, which is exactly the pattern that sets an intermittent code and then clears it.

How do I catch a fault that never happens while I am watching?

Let the tool watch instead. Set the scan tool to record with a trigger on the bank 2 position parameter, then drive the vehicle under the conditions the freeze-frame described. One captured dropout, with the surrounding data, tells you more than an afternoon of static measurements — and static measurements on an intermittent are expected to read normal, so they are not evidence of anything either way.

There is a stuck-runner code stored with it. Do I need to fix the mechanism too?

Not until the intermittent is resolved. The module decides whether the flaps moved by reading this sensor, so a momentary dropout can make it conclude a movement failed when nothing mechanical went wrong at all. Fix the signal problem, clear every code, and drive the vehicle. Only the codes that return on their own after that describe real mechanical faults worth spending money on.

OBD-II trouble code

P2023: Intake Manifold Runner Position Sensor / Switch Circuit Intermittent (Bank 2)

An intermittent fault on the expensive bank. Because labour is most of the bill on a rear-head sensor, this is the one code in the family where guessing at the part is the wrong move — the diagnosis has to be conclusive before anything is bought.

Low severityPowertrainAir Intake / Manifold ControlDrivable short-term

Quick facts

System: Powertrain
Category: Air Intake / Manifold Control
Severity: Low severity
Drivable: Usually safe to drive short-term
Repair cost range: $120 – $950
DIY difficulty: Intermediate DIY

What does P2023 mean?

Two things make this code awkward, and they compound each other. The fault is not present when you look for it, and the component it points at is the hardest one in the family to reach.

That combination changes the economics of the repair, and the economics should change the method. On an accessible sensor, replacing the part on reasonable suspicion is a defensible shortcut — if you are wrong, you have lost the price of a sensor and half an hour. On a rear-head bank 2 sensor, where the part may be a fifth of the invoice and the rest is access, being wrong means paying for the whole job twice. So the rule here is simple: get conclusive before you buy.

The good news is that the most likely cause on this bank is the cheapest thing to check. Bank 2's connector is the one that gets unplugged and reconnected during unrelated work at the back of the engine — plugs, coils, manifold gaskets, anything requiring room to work. Connector terminals are only rated for a limited number of insertion cycles, and every reconnection stretches the female terminal a little further open. A terminal that has lost its spring tension makes contact perfectly well while the vehicle sits still and loses it under engine movement or thermal expansion, which is exactly the behaviour that stores an intermittent code and then clears itself. Test it directly: pull a matching pin through the terminal and feel for drag. A terminal that accepts the pin with no resistance is the answer, no matter how well the circuit measures.

The rest of the plan should be built around the fact that you cannot afford repeated attempts. Read the freeze-frame before clearing anything — it is the only account of the conditions the module was seeing. Then, rather than hoping the fault reappears while you happen to be watching, use the scan tool as a recorder: set it to capture with a trigger on the bank 2 position parameter, drive the vehicle under conditions matching the freeze-frame, and let the data catch the event for you. One captured dropout, with its surrounding conditions, is worth more than an afternoon of static testing.

The cross-bank comparison earns its keep here too. Record both banks' position parameters together. If bank 2 glitches while bank 1 stays clean through the same commanded movement, the fault is confirmed local to bank 2's branch. If both glitch at the same instant, the shared ground or reference is implicated and the expensive sensor is exonerated before you have touched it.

One caution about what an intermittent means for the codes around it. A signal that drops out momentarily can make the module conclude the flaps failed to move, so a stuck-runner code stored on bank 2 alongside this one may describe an event that never happened mechanically. Repair the intermittent, clear everything, and see which codes come back on their own before spending anything on the mechanism.

Common causes

Bank 2 connector terminal that has lost tension after repeated disconnection during other rear-of-engine work
Connector that seats intermittently as the engine rocks on its mounts
Broken strand inside the pigtail separating and reconnecting as the harness flexes
Moisture or corrosion in the connector that conducts inconsistently
Worn spot on the sensor's resistive track producing a momentary dropout
Marginal ground splice shared with other sensors that goes resistive under heat
Wiring strained or partially damaged during previous service and now failing under vibration

Symptoms

Check engine light that illuminates and later goes out on its own
Bank 2 position reading that glitches briefly then returns to normal
Bank 2 stuck-runner codes appearing sporadically alongside
No fault present at all when the vehicle is inspected
Occasional hesitation off idle with no repeatable trigger
Fault that eventually becomes permanent and stores a hard bank 2 circuit code

Diagnostic steps

1.Read and record the freeze-frame data before clearing anything. It is the only record of the conditions present when the module set the code.
2.Check terminal tension in the bank 2 sensor connector with a matching pin. A terminal that slides in without drag is the leading cause on this bank and costs nothing to find.
3.Ask what work has been done on the back of the engine. Every disconnection of that connector reduces its terminal tension, and repeated service history is a strong pointer.
4.Record both banks' position parameters together rather than watching bank 2 alone. A glitch on both at once exonerates the sensor and implicates a shared ground or reference.
5.Set the scan tool to capture with a trigger on the bank 2 position parameter and drive under the conditions the freeze-frame described, rather than waiting for the fault to occur in the shop.
6.Wiggle-test the accessible portion of the bank 2 harness in short sections with live data displayed, working outward from the connector.
7.Inspect the connector for moisture behind the seal and confirm the seal and latch are intact.
8.Do not buy a rear-head sensor on suspicion. Confirm the fault is in the sensor rather than the connection before committing, because access is most of the cost of this repair.

Repair cost

$120 – $950

Diagnosis is the larger part of this job — $120 to $250 for the time to reproduce or record an intermittent, more if a data-logged road test is needed. Repairing or re-terminating the connector is $80 to $250 and resolves a large share of these. A sensor replacement on a rear head runs $400 to $950 installed once access components come off and go back on, which is precisely why the diagnosis should be settled first.

Estimate your repair

Run the numbers for your vehicle

Open the Repair Cost Estimator with check engine light diagnosis preselected. Adjust labor rate and vehicle category to fit your situation.

Estimate your repair cost

DIY vs shop

This is an intermediate DIY job. It usually involves diagnostic steps, specialty parts, and some careful work in tight spaces. If you have the tools and a service manual or trustworthy video for your specific vehicle, it is achievable in a weekend. Otherwise, a competent independent shop will be faster.