Worn or fouled spark plugs on bank 1 cylinders; Failed ignition coil or coil-on-plug boot on a bank 1 cylinder; Vacuum leak at the intake manifold gasket or a cracked breather hose affecting bank 1; Leaking or clogged fuel injector on a bank 1 cylinder; Low compression from a burnt valve, worn rings, or a failed head gasket on bank 1; Contaminated engine oil or incorrect oil viscosity affecting variable valve timing on bank 1; A failing catalytic converter on bank 1 that is already partially restricted and exaggerating misfire symptoms

DTC codes / Jaguar codes / P1313

P1313 · JaguarMisfire Rate Catalyst Damage Fault Bank 1

Q: What does code P1313 mean?

Misfire Rate Catalyst Damage Fault Bank 1. P1313 on a Jaguar means the engine control module (ECM) has detected a misfire rate severe enough to risk overheating and damaging the catalytic converter on bank 1, which is the side of the engine containing cylinder number one. The ECM monitors crankshaft speed fluctuations to count misfires and flags this code when the misfire frequency crosses the damage threshold, not just the emissions threshold.

P1313 on a Jaguar means the engine control module (ECM) has detected a misfire rate severe enough to risk overheating and damaging the catalytic converter on bank 1, which is the side of the engine containing cylinder number one. The ECM monitors crankshaft speed fluctuations to count misfires and flags this code when the misfire frequency crosses the damage threshold, not just the emissions threshold.

SystemPowertrain

Code typeJaguar specific

SeverityHigh

Fix difficultyProfessional

AreaIgnition system and misfire

Symptoms you may notice

Check engine light illuminated, often flashing while the misfire is active
Noticeable engine shake or rough idle, especially when cold or under light load
Loss of power or hesitation during acceleration
A rotten egg or sulfur smell from the exhaust after driving
Often no symptoms besides the warning light when the misfire is intermittent
Poor fuel economy or a strong raw fuel smell at the tailpipe

Common causes, most likely first

Worn or fouled spark plugs on bank 1 cylinders
Failed ignition coil or coil-on-plug boot on a bank 1 cylinder
Vacuum leak at the intake manifold gasket or a cracked breather hose affecting bank 1
Leaking or clogged fuel injector on a bank 1 cylinder
Low compression from a burnt valve, worn rings, or a failed head gasket on bank 1
Contaminated engine oil or incorrect oil viscosity affecting variable valve timing on bank 1
A failing catalytic converter on bank 1 that is already partially restricted and exaggerating misfire symptoms

How to diagnose and fix it

Scan all modules and record freeze-frame data to confirm which bank 1 cylinders are misfiring and under what load and temperature conditions
Inspect spark plugs on bank 1 for fouling, gap wear, or oil contamination and replace them as a set if worn
Swap ignition coils between bank 1 and bank 2 to see if the misfire follows the coil, then replace any coil that proves faulty
Perform a smoke test of the intake system to find vacuum leaks that lean out bank 1
Check fuel injector operation with a noid light or injector balance test and clean or replace a restricted injector
Run a compression test and a cylinder leak-down test on bank 1 to rule out mechanical faults before replacing catalytic converters
Verify repair by clearing the code and completing a drive cycle that reproduces the original freeze-frame conditions

Why P1313 is not just a tune-up code

P1313 is a catalyst-damage misfire code, so the ECM has already seen enough misfires to overheat the converter; ignoring it can turn a cheap ignition repair into a costly catalytic converter replacement.
A flashing check engine light with P1313 means the ECM is actively protecting the converter, and continuing to drive can melt the substrate inside bank 1's converter within a short distance.
Jaguar's misfire monitor is sensitive to crankshaft position sensor signal quality, so a failing crank sensor or damaged reluctor ring can set P1313 without any true cylinder misfire.
Bank 1 on many Jaguar V8 engines is the right-hand bank as viewed from the driver's seat, which trips up technicians who assume bank 1 is always the left side.
A vacuum leak at the rear of the intake manifold on supercharged Jaguar engines often causes bank 1 misfires that only appear at idle and disappear off idle, leading to unnecessary coil replacement.

Can I keep driving with P1313?

Do not continue driving with P1313 active, especially if the check engine light is flashing, because raw fuel entering the exhaust can overheat and destroy the catalytic converter. If you must move the car, keep the engine speed low and drive only a short distance to a safe repair location.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for Jaguar vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.